From abc news, this week with George Stephanopoulos begins now. And we begin with that emotional homecoming overnight for the last two americans held prisoner in north korea. Kenneth bae and Matthew Todd Miller touched down in Washington State on an air force jet. Their release secured when americas spy chief James Clapper hand delivered a secret letter from the president to north koreas leader kim jongun. After hugs from his family, bae reflected on two years in captivity. I learned a lot. I grew a lot. I lost a lot of weight, in a good way, but i am standing strong because of you. All of this happening as president obama heads to asia this week leaving behind a capital shaken up by that Midterm Election earthquake. The gop now in solid control of congress. The president s team scrambling to salvage its final two years and were going to analyze all the fallout this morning beginning with jon karl at the white house. Good morning, jon. Reporter good morning, george. The president departed overnight and will spend the next week on the other side of the world seeking to redirect u. S. Foreign policy towards asia while here at home, the new Republican Leadership gets settled in. The president has already broken bread with congressional leaders but he is off to a rocky start with republicans. It was a lunch that brought no real breakthroughs and apparently no smiles either. The president acknowledged the message from tuesday nights drubbing of democrats was loud and clear. The American People just want to see work done here in washington. Theyd like to see more cooperation and i think all of us have the responsibility, me in particular, to try to make that happen. Reporter but despite the election wave that swept republicans into control of the senate it is time for a new way forward. Reporter president obama insists hell still take executive action on Immigration Reform before the end of the year in defiance of republicans in congress. If they want to get a bill done, whether its during the lame duck or next year, i am eager to see what they have to offer. But what im not going to do is just wait. Reporter and the white house says theres no backing down on that. Even though hes had a chance to sit down to talk to them about it, hes completely closed to the idea of delaying this executive action. Not even willing to talk to them about delaying hes going to take that executive action before the end of the year. Reporter but Republican Leaders warn if the president goes around congress on immigration, it will poison the well on virtually everything. When you play with matches, you take the risk of burning yourself, and hes going to burn himself if he continues to go down this path. Its like waving a red flag in front of a bull to say, if you guys dont do what i want, im going to do it on my own. Reporter so what issues show the biggest chances for actual agreement . There are bipartisan calls for trade, Corporate Tax reform, Infrastructure Spending and the Keystone Pipeline and despite their track record, president obama and republicans showed some signs they may be ready to turn the page. Just because you have divided government doesnt mean you dont accomplish anything. I would enjoy having some kentucky bourbon with Mitch Mcconnell, so i think we can have a productive relationship. Reporter for democrats tuesday was certainly a drubbing but its hardly unprecedented. In fact, going all the way back to world war ii, all four president s who served two full terms faced a congress controlled by the opposing party for their last two years. George. That is what happens. Okay, jon, thanks very much. Overseas the president finds himself in a position he did not anticipate, certainly did not want, sending more troops to iraq. The white house announced friday it was doubling the number of troops in the fight against isis and abcs chief Global Affairs correspondent Martha Raddatz is on that story. Reporter doubling down against isis in iraq, first it was 300 troops on the ground to protect diplomats growing to almost 1600 to train and advise, now up to 3100 approved, not to mention hundreds of air strikes including these on the besieged town of kobani this weekend. So, what will these troops do . Outside erbil in baghdad two expeditionary Operation Centers will be built to advise and assist iraqi and kurdish forces. And at least four additional training sites will be set up in the volatile north, south and al Anbar Province in the west. The white house insists these are not combat troops, but that is some hot territory. Isis strongholds, no question theyll be in more danger. And americans in iraq will get, quote, an appropriate array of force Protection Capabilities which will likely mean attack helicopters. Matt bradley has been reporting on the ground in iraq for 18 months. We spoke to him on skype from baghdad. Most iraqis know that the Obama Administration is going to stick to the commitment that its made to not deploy these troops into a wartime scenario but they do see this as one more step towards the inevitable. There has to be u. S. Troops on the ground because the Iraqi Military is simply incapable of fighting the islamic state. Reporter and this week, president obama is saying hell ask for even more support from congress. Im going to begin Engaging Congress over a new authorization to use military force against isil. Reporter and when one of the most powerful voices in the newly elected Republican Senate says things like this we need to understand that the president is the commander in chief and that role, i do not believe, should be impinged upon by the congress. Reporter the president just might get his wish. For this week, Martha Raddatz, abc news, washington. Thanks to martha for that. And we ares joined by republican congressman darrell issa, chair of the House Oversight and, congressman darrell issa, thanks for joining us. Are you prepared to vote for an authorization of this mission in iraq . I am, george. I was just in both baghdad and erbil in addition to six other nations in the middle east between august and erbil just a few weeks ago. The fact is were already there. Weve had to be there. The government in baghdad is still quite delusional, if you will, about what the real impact is. Theyre still talking about longterm training before theyre ready to fight, so the fact is that if were to protect the gains we made against islamic extremism, my marines from Camp Pendleton and others are going to have to go back again. Theyre going to go back. Should they be in combat position . Iraqis should fight for their country. Theres no question at all. Theyve been trained and they should do it. The fact is the kurds are willing to do it. I have no doubt whatsoever that the kurds will fight and all they need is our air support and our technical knowhow and they will do it. When it comes to the sunni shia divide that the maliki government created, it makes it very, very hard to put together the kind of military units that they should have. That remains to be seen of whether or not the substantial portion of that 800,000 people we trained are willing to fight. The fact is, by the time they started fleeing, we were down to 250000, and when i met with the government they said, well, we have about 8,000 would will fight. I think they have to do better. Let me turn to the broader issues facing the president and congress in these next couple of years. The president is making it very clear hell act on immigration on his own before the end of the year. What are the consequences . Well, the consequences are lost opportunities. In the last congress i authored the skills visa act that not only would have allowed and promoted the best and the brightest being allowed to remain here and add to our economy, these stem, if you will graduates but it scored 100 billion of new revenue to the government. That can be paired with other Immigration Reforms and if the president is willing to work with us in the house and the senate, we could make that happen. If not, shutting down the government. Im not predicting what the result will be other than in my 14 years on judiciary and the work ive tried to do on immigration, time and time again, people have missed opportunities. The fact is our farmers in california need an effective worker program. The reality is that we send home to Foreign Countries the best and the brightest from around the world when, in fact, theyd like to stay here and add to our economy. We need to Work Together to solve both of those problems. Im hoping the president will delay and have a real comprehensive discussion about yq÷ deal is possible on Immigration Reform. Well, lets see if he takes your advice. Congressman issa, thanks for your time this morning. Now to that major new threat targeting our nations Critical Infrastructure and learned this week that hackers have broken into the Computers Controlling our utilities. The life lines for water, gas and power are. Our experts here to weigh in on the dangerous consequences and what can be done to prevent them after this from abcs senior justice correspondent pierre thomas. They just issued a critical alert. The entire network went down. Reporter in the movie live free or die hard, they were able to shut down the power grid and transportation network. That kind of dramatic threat may not just be the stuff of hollywood fiction. In fact, closer to reality than you think. Sources tell abc news hackers in overseas secretly planted Malicious Software inside computer systemed serving our nations most Important Services and industries. Water treatment facilities, power plants, gas pipelines, all critical for daily life now potentially at risk. Authorities believe this electronic trojan horse was inserted into Computer Systems years ago but its not been activated. Theyve given it an ominous name, black energy. In theory black energy could allow a hacker to turn off a generator, flood a Water Treatment plant or shut down a gas pipeline. The threat is ongoing. Abc news obtained a new Homeland Security bulletin that warns, utility owners and operators to look for signs of compromise and to report any suspected intrusion immediately. U. S. Officials are worried because they have hard evidence that such a cyberattack is possible. In this test government hackers forced this generator to selfdestruct with a series of simple keystrokes. Watch. The generator is literally shaking itself apart. As for black energy, the primary suspects, operatives tied to the russian government, and sources say it resembles Malicious Software used in recent attacks on nato and unclassified white house Computer Systems. It may all point to the beginning of a new cold war with the internet as part of the battlefield. Terrorism is still the Number One NationalSecurity Threat but weve seen cyber grow at an alarming rate and the threats that we face, the number of actors, the number of breaches, this is a real problem. Reporter its a new world where threats you cannot see can reach out and touch you. For this week, pierre thomas, abc news, washington. Thanks to pierre. Were joined now by abc contributor, former white house counterterrorism adviser Richard Clarke and Democratic Congress maman jim langevin from the Armed Services committee. Richard, let me begin with you. Since you left the government you devoted time and study to the threat from cyberattacks and youve concluded that were a lot more vulnerable now than we were then. I think thats right. I think nation states have been building cyberarmies, cybercommands including the United States and theres probably a half dozen nations around the world that have already put these logic bombs in each others networks, not that theyre going to use them unless they go to war. So unless we but thats what i dont understand. So explain that a little bit. This black energy malware which is now in our systems, we believe, why just park there . Well, because you want to be able to get in when you can get in. It may be that if you wait itll be too late to get in, new defenses will be created. You want to have the c when the war starts and bring the enemy to his knees. And so most modern nations now have tried this with their potential enemies. And, congressman, you know the federal government has also studying these threats to the power grid showing the vulnerability of our power grid, attacks on a small number of transmission stations could cause the whole power grid to collapse. How serious is this threat . It is very serious and ive been talking about this for a number of years going back to about 2007 when i chaired the Homeland Security subcommittee that had jurisdiction over cybersecurity and we did a deep dive on this looking at how vulnerable Critical Infrastructure is, in particular how vulnerable our electric grid is and found its very vulnerable. National labs actually did that study that showed that the generator through a skater attack thats a systems control and Data Acquisition system attack could be used to cause a generator or a number of generators to blow themselves up and you could see a whole sector of the country without electricity for a period of not just days or weeks but potentially months because these generators are large, theyre not just like batteries that are sitting on a shelf that you can take one out and plug another one in, these generators take months to build, ship and install. So, Richard Clarke, what can be done to prevent that . Very little. But the thing here to really bear in mind is this is not about to happen. We have Nuclear Weapons we havent used them. We have cyberweapons and weve seldom used them. The United States did do a cyberattack on iran and destroyed some Nuclear Centrifuges but this is a contingency and its very unlikely that it will be used by nation states. The real worry is that eventually nonstate actors, maybe even terrorist groups will gain this. Is this the real threat . Yeah, and richard hit it right on the point right now. Right now these worst weapons and cyberweapons are in the hands of nation states who have the capability but not necessarily the will to use them. But then you have groups like isil or al qaeda that certainly would have the intent but not the weapons, and that gap, that divide, if you will, is becoming much more narrow and eventually the worst actors will have the worst weapons and potentially will use them against us. Ive been trying to raise the alarm on this as richard has been to try to close that aperture of vulnerability. This is not a problem that were ever going that were ever going to solve. Its one that we need to manage. We need to close the aperture of vulnerability to something that is much more manageable so what we need to do in congress is pass an information sharing bill, that bill passed and was unanimous out of the House Intelligence Committee which i sit and passed the house with strong bipartisan support and now were waiting for the senate to take it up. That would allow classified threat information to be passed to the private sector and for the private sector to pass the threats or the attacks that theyre experiencing back to the government so information could be more widely shared. Lets hope that happens. We also need stronger regulatory control. Okay. Lets hope that happens. Thank you both for your time this morning. Coming up, a surprising decision from the Supreme Court on obamacare. Is chief Justice John Roberts about to reverse course and strike down the heart of the law. Plus one of the elections big new stars joins us live. The roundtable weighs in on what it means for 2016. 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