President obama is back in washington following a nineday overseas trip that was supposed to focus on economics but quickly moved to terrorism. Before leaving malaysia the president promised that he would destroy isis. But on sunday the Top Democrats on the Senate IntelligenceCommittee Told cbs news the president s plan is not sufficient. This as the capital of belgium, brussels, remains on lockdown. The investigation in paris continues. And as americans enter one of the busiest travel weeks of the year. According to a new poll, 83 of registered voters believe a largescale terror attack in the u. S. Is likely in the near future. We have reports from paris, new york, and washington. But we start with debora patta in brussels. One of several cities where Police Conducted raids on sunday. Reporter brussels remains a city in lockdown tonight with several Police Operations under way as the threat alert remains at its highest level for the countrys capital. The metro is still not open, and tomorrow the security measures for the unprecedented closure of the capital schools. A toplevel security meeting was held in the city earlier. Belgiums prime minister, jean michel, stressed the threat of an attack remains serious and imminent. We are worried about an attack like those in paris with several individuals, he said. Possibly targeting commercial centers, streets, or public transport. Still at large is salah abdeslam, europes most wanted man and a prime suspect in the paris attacks. Authorities believe he might be in belgium, his last known destination. But police have their hands full as they are also hunting for several more men in connection with this latest Terror Threat against brussels. Abdeslams brother, mohammed, made another appeal on local television today for him to turn himself over to police. Wed rather see salah in jail, he said, than in a cemetery. Security net, the first images of the french raid in saintdenis last wednesday have emerged. The shootout lasted seven hours, and more than 5,000 bullets were fired. [ gunfire ] when it was over, three people had been killed, including the suspected ringleader of the paris attacks, and eight more had been arrested. Brussels is certainly a lot more tense tonight. Security forces patrolling the streets have been stepped up. And not far from here a number of Police Operations are under way. In fact, one is just finished here on the square. But police have urged both the media and the public to stop reporting their movements on social media as this could compromise their security. Jeff . Debora patta in brussels. Debora, thank you very much. Here in the u. S. It is one of if not the biggest travel week of the year, and there have more now from jaimie yuccas at lagardia airport in new york city. Reporter 46 million will travel this weekend and they will see extra officers at virtually every airport, train station, and destination in the country. Homeland security secretary jeh johnson says his agency is ready for anything. I always hesitate to rank threats, but the potential copycat, the lone wolf actor is one that were continually focused on. Reporter lines at the airports will be longer and slower. The tsa says it will handle 25 million passengers this week with enhanced screenings. New york passenger sherry tropan left for miami today. Aware of the increased security now and that people may be a little more nervous. Reporter if travelers are nervous, so are the airlines. Just this week southwest delayed in two cases passengers were arabic. Today three passengers said to flight from indianapolis to los angeles forced a diversion to kansas city. Phony bomb threats redirected three flights this week from the u. S. Headed overseas, including a Turkish Airlines flight to istanbul this morning. Today in new York City Police held a threehour active Shooter Drill in the citys subway system. For the first time their drill included an attacker in a suicide vest. We have now beefed up our resources that were in a position to handle a significant number of events going on simultaneously or sequentially. Reporter the department of Homeland Security says there are no Credible Threats anywhere in the u. S. We urge you to continue to travel. Go to public events. Go to public places. And know that our folks are on the job. Reporter extra security measures are also in place for United States. Jeff . Jamie, thank you very much. Concerns about terrorism are also playing out in the president ial campaign. A new cbs news poll shows about 40 of republicans in early voting states say their choice of a candidate was at least somewhat influenced by the paris attacks. In all three states, iowa, New Hampshire, and south carolina, donald trump has a commanding lead. Heres julianna goldman. Reporter with National Security concerns rising, donald trump leads the republican pack. Retired neurosurgeon ben carson is slipping. And senators ted cruz and marco rubio are gaining ground. Im leading every poll by a lot. Its not even a little bit anymore. Reporter in the wake of the paris attacks, at least 2 3 of Republican Voters in the three early contests say a candidate must agree with them on how to handle isis in order to get their vote. Favor sending u. S. Ground troops to the middle east to fight the today trump built on his controversial policy prescriptions, saying he would resume waterboarding, create a watch list for refugees, and monitor mosques. Peanuts compared to what they do to us. Reporter in another new poll, 25 of New Hampshire primary voters say trump is best equipped to handle the u. S. Response to isis. Rubio lags behind with 13 . What happened in paris could happen here. Reporter the florida senator said his campaign was using the issue for its First Campaign ad. I obviously am not happy about the events that happened last week in paris, but i think it suddenly has cast forced americans to confront more carefully the issue of National Security. Reporter the rise of rubio and cruz has come at the expense of ben carson, Whose Campaign admits the retired neurosurgeon has been hurt by the focus on National Security. Whos got the most experience . I dont know that it necessarily comes down to politics. It comes down to practical experience. Reporter to burnish his Foreign Policy credentials carsons campaign is considering a foreign trip ahead of iwa, asia, australia, and africa have been mentioned. French president Francois Hollande is visiting several World Leaders this week, including president obama at the white house on tuesday. Back in paris, a return to normalcy has been elusive. Elizabeth palmer is there. Reporter if youre young enough, paris feels as enchanted as ever. The Big Department stores have decked out their windows, and a Christmas Market stretches down the champs elysees. Closed for four days right after the attacks, the stall owners have lost a lot of business. And now theyre open again, says margo, sales are slow. Walking . Many people walking, yes. But so many people walking here and so many people dont pay. Reporter nobodys spending the way they usually do. Very difficult. Reporter business is down all over. By a third in the restaurants and cafes. And the chamber of commerce says Hotel Revenues are down by half, as tourists cancel their plans. Lily carvallo and ken eisner bucked the trend. But. There is like a black cloud around it. Reporter reinforced by the sight of heavily armed soldiers all over the city. This constant awareness that you dont know what is going to be hit next or it will, or if there is any place safe. Reporter since the attacks the french have rallied around national symbols. And thats been good news for the cogniaume family who make flags in whats not normally a flagwaving country says enzo. When you have a french flag on yourself or in your house, its an act of patriotism. Reporter and a declaration that terrorism will not defeat the values of the french republic. Of course economies do bounce back after terrorist attacks. But in this case this is the second one in less than a year. And jeff, the french government has warned that there may be more of them. Liz palmer, thank you. The Security Team for pope francis nearly doubled in size last week just before his visit to africa, which begins wednesday. And as allen pizzey reports, the extra security was evident today at the vatican. Reporter the rampedup security was in place long before the faithful even began to arrive. Armed police from italys numerous forces were on every corner. Everyone who arrived for the popes weekly angeles was checked, bags opened, random patdowns. And that was just to get into the street in front of st. Peters basilica. The line stretched for several blocks for those wanting to enter the square itself. That involved another layer including metal detectors. The security wasnt just a reaction to the paris attacks. Some months ago the cover of the isis online magazine had a photoshop of their flag flying from the obelisk in the center of the square. The implied threat didnt worry ernest and Joanne Morelli from st. Petersburg, florida, however. We feel like the carabinieri are doing a pretty good job. Theyre all over the place. We dont feel as if anything could happen at this point. I mean, obviously it always could. But we feel fairly safe. Reporter pope francis is known to be indifferent to his own security. But aides say he is deeply concerned for those who flock to see him. The only way to ensure complete security in a place like this is to stop the terrorists well before they reach the target. But as both sides know only too well, the police have to get it right every time. The terrorists only have to get allen pizzey, cbs news, rome. The city of chicago is on edge just before the release of a video showing a white Police Officer shooting and killing a black teen. Jericka duncan has more on this. Reporter 17yearold Laquan Mcdonald was shot 16 times in october of last year. His familys attorney, jeff meslin, has seen the Police Dash Cam video. First shot or two seemed to spin him to the ground. He falls down. Hes down on the ground. And then for the next 30 seconds or so in this video the officer just continues to shoot. Reporter a judge ordered the video be made public by wednesday after the city rejected several freedom of information requests. Police superintendent Gary Mccarthy says they are prepared for possible violent protests. We will facilitate peoples First Amendment right to free speech. We will facilitate protest, quite frankly. But we will be intolerant of criminal behavior. Reporter Community Activists are calling for calm. But reverend Jesse Jackson frustrated. People are disgusted and many are angry. Most are angry. The question becomes when will the cup runneth over . Reporter the night mcdonald was shot Authorities Say he had a fourinch folding knife and officer jason van dykes attorney dan herbert says mcdonalds behavior was erratic. He firmly believed he was in fear for his life and he was concerned about the life of his fellow officers. Reporter the Mcdonald Family reached a 5 million settlement. Jeff, the attorneys for the interest in seeing that dash cam jericka duncan, thank you very much. Still ahead here, Police Identify a suspect after a stunning shooting of a medical student in new orleans. And the growing threat of the approaching el nino. The cbs overnight news will be right back. So i switched to tide pods. Theyre super concentrated so i get a better clean. 15 cleaning ingredients or 90 . Dont pay for water, pay for clean. Hey buddy, lets get these dayquil liquid gels and go. But these liquid gels are new. Mucinex fast max. Its the same difference. These are multisymptom. Well so are these. This one is max strength and fights mucus. That one doesnt. Uh. Think fast you dropped something. Oh. Ill put it back on the shelf. New from mucinex fast max. The only cold and flu liquid gel thats maxstrength and fights mucus. Start the relief. Ditch the misery. Weekend it still feels like summer, with temps in the mid 80s in l. A. But that may not be true for long as the focus turns to winter and what could be an historic el nino. Heres ben tracy. Reporter its already a Winter Wonderland in californias mountains, and theyre expecting a lot more snow. Scientists say a massive el nino in the pacific is still getting these warm ocean waters near the equator forced the jet stream that usually dumps rain on Central America north, bringing a Conveyor Belt of storms to california and the southern u. S. This current el nino has now which was the biggest on record. So its huge. Reporter josh willis is a climate scientist with nasa. He says el ninos typically impact southern california. But this one is so big it will hit the entire state. Why is it important that a lot of these storms hit Northern California . Our water supply is tied to Northern California, and its been in a drought for more than a decade. Reporter californias largest reservoirs are in Northern California, and they are at historic lows. But el nino comes at a cost. Those storms in the winter of 9798 caused half a billion dollars in damage and killed 17 people in california. Still, after four years of intense drought, the state needs get. Ben tracy, cbs news, los angeles. Police in new orleans tonight are looking for a suspect following a dramatic shooting. Surveillance footage shows the victim, peter gold, a tulane medical student, being shot as he tried to stop a gunman who was dragging a woman into an suv. The suspect tried to shoot gold again in the head, but the gun jammed. Gold is expected to survive. The suspect is 21yearold euric cain, whose criminal record includes weapons charges. Up next, the boots that are back. Winter weather means a busy time for fashion brands, always trying to stay ahead of the but as one old school retailer is discovering, sometimes the best way to keep current is to remain the same. Heres don dahler. Reporter theyre rubberbottomed, terminally unsexy, and virtually unchanged for over 100 years. And yet, l. L. Bean cannot make its signature duck boot fast enough. Weve hired well over 100 people and are in various stages of training. Reporter according to manufacturing chief royce 60,000. Do to build boots. We build them one pair at a time. Reporter the reason for the rush is a mystery. Inexplicably, the boots have hit the catwalk and have been spotted on the fashionable feet of actress kerry washington. Duck boots have inspired designer tommy hilfiger. And kanye west recently launched his yeezy duck boot. Sales have tripled in three years and are projected to hit half a million this year. And now women have surpassed men as the primary customers. Its a trend. Its a fashion thing. Its a desire. Youre asking me to figure out why a woman does what she does. Its the wrong question to ask. Reporter the bean boot was the very first product designed in 1912 by outdoorsman leon leonwood bean. And he came back from a hunting trip with wet soggy feet wearing footwear that was available, most likely all leather. Reporter bean came one his shoe with a rubber bottom creating the classic bean boot, still sold today. Tricked out a bit for new customers, but traditional tan and brown for the diehard fans. Ive heard it said that the boot is like an old friend. Those that have bought boots, we see boots that are 30, 40 years old and they send them back to be rebuilt because they dont want to get rid of them. Reporter with three shifts and more workers, bean is handproducing 50,000 pairs a month and bracing for the holiday rush. Don dahler, cbs news, new york. Still ahead here, no joke. We close tonight inside a class for clowns, where volunteers get a crash course parade. Heres contessa brewer. Reporter college is not all fun and games. Whoo reporter even for a bunch of at clown u there are tough lessons. One, two, three. Reporter and rules to follow. No cell phones, no smoking, no drinking. Drinking drinking. You mean water. You mentioned going to the bathroom . Thats not easy. Reporter karen mccartys a true professional with the big apple circus in new york. As a professor shes seen a lot of freshman jitters. A lot of times theyre imagining being in front of that many people. Reporter but they get over it fast. And if you think its crazy to get a whip nae nae lesson in a lecture hall, wait till you get a load of the lab. Whoever has an itch turn to someone in the audience. Reporter in class its all about funny business. As youre walking away look over your shoulder. Youll see people scratching. Reporter where assignments for the thanksgiving day parade include pinwheeling, interpretive dance, and of course horsing around. To be a clown is to be as human as possible and to project that. Exaggeratedly human. Im going to do a swoosh motion. Reporter at clown u you dont have to be born a clown. You can learn it. Like returning volunteer john plotsky. Do you remember the lessons when youre actually out there on the parade route . Yeah. It helps. It gets you focused as a team and a group and gets in the spirit of the holiday. Reporter this may be the only school where landing at the top of the class is a piece of cake. Contessa brewer, cbs news, new york. That is the overnight news for this monday. For some of you the news continues. For others check