Why did it take him so long to say the president was born in the United States which is a fa fact. And Hillary Clintons health scare. Its great to be back. Clinton on the mend. But facing renewed questions about her campaign transparency. Her running mate tim kaine here live. Announcer from abc news, its this week. Here now, coanchor martha raddatz. In the middle of heated political campaigning, a shocking reminder that we live in dangerous times. Anxiety and uncertainty in new york after that explosion overnight. And the urgent question, was it an act of terror . Lets get straight to abc news chief investigative correspondent brian ross who is just feet away from where the explosion occurred. Brian . Reporter good morning, martha. Urgent search under way here loose. The person responsible for the frightening events here just down the street last night. All this as president obama and dozens of World Leaders arrive in new york for the opening session of the United Nations general assembly. The bomb came on a final summer saturday night as new yorkers walked to restaurants, movies. And then, the Surveillance Video inside a Fitness Center shows the blast just after 8 30. Om reporter a white flash as glass shatters. 615, theres an explosion. Theres units saying there was an explosion from a garbage pail. Have units stay off the block. Windows shook. It was really scary. Then i couldnt hear for 16 minutes out of my left ear. We want to be very clear, the intentional indication that this be in tool box left next to this construction. Despite the power of the blast no one was killed. There were 29 injuries here, one considered serious. 24 of these people have been transported to area hospitals with various degrees of scrapes, abragss from glass, from metal. Reporter then, two hours later, and just four blocks device. In what appears to be a Pressure Cooker found inside a plastic bag with wiring and a cell phone attached. The new York City PoliceDepartment Bomb Squad removed the device as bombsniffing dogs searched the area for even more suspicious packages and police at the nyp Counterterrorism Center scanned Surveillance Videos from cameras looking for clues for who was the bomber. Also working to see if there are any connections and similarities between the bomb here and a bomb that was set off yesterday morning in new jersey at the beginning of a charity race about 60 miles away. The may wror of new york is the city said theres no evidence of terrorism. But others say that remains an open question. Thank you, brian. Both candidates for president reacted quickly to the breaking news. From new york, Hillary Clinton cautious as ever. While donald trump, used news to sound the alarm. 12k3w4r just before i got off the plane, a bomb went off in new york. And nobody knows exactly whats going on. But, boy, we are living in a time, we better get very tough, folks. Ill have more to say about it when we know the facts. I think its always wiser to wait until you have information lets bring in abc news justice correspondent Pierre Thomas and abc news consultant and former fbi agent brad garrett. Good morning, gentlemen. I wa the definition of terror, you heard the mayor say this was an intentional act, found no evidence that the blast was linked to terrorism. What regetting too caught up in these definitions . Absolutely, thats going to kill people or harm them, thats some act of terrorism. It may not be extremist. We have to be clear this person wanted to harm fol zblx that Pressure Cooker that theyre looking at right now, brad, there was a lot of panic about that last night. Absolutely, im not sure they still exactly know what they think about the Boston Marathon bombing. You said you were listening in realtime to what was going on. Yes, literally nypd are running around, evacuating the neighborhood because theyre thinking, second bomb, first one went off, why wont this one . You got to get people out of the area. This tiein theyre looking at the Pressure Cooker, but you have theres a tiein there, you have these two explosive devices. Central park last july, there was an explosion, a hobbyist, it plue off a young mans leg. Will they look at that again . Everythings on the table again. They need to know who did this and they need to know now. The key this morning my sources are telling me are forensics. When you have a bomb or theyll try to put the parts back together. Theyll look for finger prints. Same with the Pressure Cooker. They still dont know if thats an a actual bomb yet. Brad, walking up to that dumpster, they got that on surveillance as brian said, a pretty big box that was put next to that dumpster, would that make them blend in a little its a construction dumpster. It gives you, martha, a lot of cover to get away. Its an odd location. What is he attempting to blow up there . Almost like theyre dropped and whats going to happen next . But it just shows how easy this is to do. These werent complicated devices as far as we know, right, pierre. Know. The lone wolf scenario is what Law Enforcement has been concerned with for some time. They have someone whos out there willing to kill. Okay, thanks very much to both of you. Well keep our eye on this in the coming weeks. Turning now to the big political story of the week the birther battle, long before the muslim ban and the tough talk on trade, trump made his political name by stubbornly pushing that fa he wasnt born in this country, which is real possibility, then hes pulled one of the great cons in the history of politics. I want him to show his birth certificate. Theres something on that birth certificate that he doesnt like. If he gives his passport applications and records, i will give to a charity of his choice 5 million. Offensive to so Many Americans because it attempted to undermin the legitimacy of the first africanamerican president. Friday, trump finally admitted the truth that mr. Obama is american born. Hillary clinton and her campaign of 2008 started the birther controversy. I finished it. President in the United States, period. Hillary clinton who did not start the Birther Movement, not letting trump off the hook. Hes feeding into the worst impulses, the bigotry and bias that lurks in our country. And last night, the president who has mocked trumps birther fixation many times got in one last dig. Whole birther thing is over. Isil, north korea, poverty, Climate Change none of those things weighed on my mind like the validity of my birth certificate. As for trump, he stayed away from the media since his declaration. Sticking instead to big, energetic rallies. So, when we traveled to indianapolis saturday to interview vice candidate mike pence, it was the first opportunity to put all the unanswered birther questions directly to the republican ticket. On friday, for the very first time, mr. Trump said that barack obama was born in the u. S. Why did it take him so long . Well, let me say that the momentum in this campaign is really overwhelming and i think its because donald trump has been focusing on issues that the about. He brought that issue to an end this week. Other than many in the National Media, as i Campaign Across this country with donald trump and for donald trump, the American People arent focused on the debates of the past, theyre focused on their future, hes offering Real Solutions and the kind of strong leadership that the American People know will make America Great again. Governor pence, trump could have put this issue to bed a long time ago. Just last wednesday he was asked by the washington post, do you believe the president was born in the United States . He said he wouldnt answer it then. A major announcement he talked about on friday, he kept this issue going. Why did it take him so long to say that the president was born in the United States, which is a acknowledge that without hesitation. But, i have to tell you, i understand why many in the National Media and Hillary Clinton but governor pence its not just the National Media. We counted since april of 2011 and thats the year that barack obama gave his long formed birth certificate from hawaii. We counted 67 times where donald trump messages questioning his birthplace. He has kept this going. He has been a leader in this Birther Movement. Well, i know theres news reports that trace this Birther Movement back to Hillary Clinton campaign back in 2008. You believe that Hillary Clinton started the Birther Movement. Look, ill let the facts speak for themselves. Whats the proof of that . Martha, look, as i travel very respectfully to you, this isnt what the American People are talking about. Why did it take him so long to put it an end . Its not over. Hes been talking about the need to have a stronger america at home and abroad. I understand why Hillary Clinton and many of her defenders in the National Media what distract attention from her dishonesty and her foreign stage and the fact that she wants to simply continued the failed policies of this administration that have run our economy literally into a ditch. Thats not working. I promise you, the American People see through all of this. Thats why donald trump is going to to be the next president of the United States. Yesterday, they talked about the birther issue, they believe fueled in part by what donald obama was born outside the u. S. This fuels those conspiracy theories. Do you think he should have promoted this birther issue for all these years . Was he wrong to do this . Our Campaign Just really isnt focused on the past, martha, and it really governor pence, you said yourself Hillary Clinton is at fault. Thats going forward, thats not just the past. He said friday that hilla fault for this Birther Movement as well. And you just said it yourself, what is the proof because we cant find any. And factcheckers have checked into that. I would refer you to news reports and reports of people in my industry. They say theres no proof they can find that Hillary Clinton had anything to do with on it. I understand the desire of many in the National Media to change the subject from Hillary Clintons disastrous record and her dishonesty, were just not going to play that game. You know, yesterday n the midst of this sidebar debate that so many in the National Media are fascinated about the largest endorsed presidedonald trump fo president of the United States. They know donald trump is the kind of president thats going to stand with the men and women in Law Enforcement in this country and restore law and order. Im going to ask you a few more questions on this because also, in the midst of this, you want to talk about issues and tweeted a article Donald Trumps birther event is the greatest trick hes ever pulled. Seven weeks out of a very serious election is what he should be doing. The fact that donald trump on friday used the medias preoccupation with certain sidebar issues to really focus on the support that we enjoy from ti generals, now, i think some 150 medal of honor winners. Recognize that donald trump is the right choice for the next commander in chief of the United States. And i have to tell you, i think he paid as much attention as the American People are, we have more horrific stories about isis coming out this last week, a terrorism that we havent seen the advent of the global war on terror. America knows we need a commander in chief that will rebuild our military. I want to talk about that, robert gates who has worked for eight president s over a 50year career including as secretary of defense, cia agent, he was very critical of both candidates. But of mr. Trump he said, at least on National Security i believe mr. Trump is beyond repair. He is our country and government, and temperamentally unsuited to leave our men and women in uniform. Look, i have a lot of respect for secretary gates, worked with him during my years on the Foreign Affairs committee. But hes just wrong. Thats the reason we have so many members of our armed forces that come out to rallies in support of donald trump. Standing with him. Hes broadshoulder leader. He also is willing to speak truth to power. The simple truth is, during his tenure as secretary of defense, he was part of the withdrawing of iraq. And the way that we got without renegotia renegoin any combat forces in iraq created a vacuum in which the isis caliphate was able to rise up and compromise large areas of iraq to this very day that were hardfought and won by the sackry fiegss of american soldiers. So, i thauns secretary gates may not want to hear it. On friday night, mr. Trump said Something Else thats gotten a lot of attention. He said the secret service lets see what happens to her. What did he mean by that . Well, i think, you know, donald trump believes in the safety and security of every american and any suggestion otherwise regarding secretary clinton is just nonsense, i mean the point that he was making, if Hillary Clinton has had private security for the last 30 years she would deny the right of law abiding citizens to have a protect their own families. If Hillary Clinton didnt have that security she would probably be a lot more supportive of that second amendment. Lets see what happens to her. The message sounds like a threat or encouraging violence. Thats absolute nonsense. His comment was that if she didnt have that security she would change her mind. The truth of the matter is, its i just joined this campaign a couple of months ago. Martha, i got a lot of respect for you, people if the media are talking about what trump over the last week than the 30 years of the clintons. The fact that her campaign couldnt even be honest about her own health situation, i mean we wish her well, were trail, but decades of dishonesty flowing out. I want to talk to you about some of the namecalling. You said in a 2000 campaign you didnt think there was any place for personal attacks. Are you comfortable with things with the campaign selling say, liar, hillary for prison. You know, i have my own style and donald trump has his own style. And i could tell its resonating. Both of our styles are you comfortable with that. I am really. With that namecalling . Things are different here in indiana, people talk differently about things. The point that donald trump has been campaign is connecting straight with hearts and minds of the American People. I really do believe that were going to have a great day come november 8th. Thank you, governor, pence. Thank you, martha. Thanks. Coming up, much more of my interview with governor pence, including his surprising answer about which Vice President he would model himself after. First, a response from his democratic rival, vice is standing by live. Announcer this week with George Stephanopoulos is brought to you by pacific life, helping generationsover families achieve longterm Financial Security for over 145 years. Like a human fingerprint, no two whale flukes are the same. Pacific life has been delivering flexible retirement and Life Insurance solutions for more than 145 years. Ask a Financial Advisor how you can Tailor Solutions from pacific life to help you reach your financial goals. 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