National Security Adviser Michael Flynn resigns

Michael Flynn, one of President Trump's earliest supporters, who faced questions about a phone call to the Russian ambassador before the inauguration, has resigned.
2:39 | 02/14/17

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Transcript for National Security Adviser Michael Flynn resigns
Breaking news overnight. President's desk you advisor Michael Flynn forced to resign. Three weeks after the White House was told by the just farm that he could be vulnerable to Russian blackmail for not telling the truth about its context of the Russian ambassador. BC's chief White House correspondent John Carl has all boys and John this is extraordinary. The White House was warned that the presence Nash could advisor could be a national security threat. It unbelievable. George and Flinn really had no choice but to resign. He would miss the wed at the White House and the president had clearly lost confidence in him. General Flinn was front and center is president trump met with the Canadian prime minister but he had already fallen out of favor. The president refusing to even answer whether he had confidence in him. In his letter of resignation Flynn made it clear. He was leaving because he had misled vice president pence and other senior officials. About his conversations. With the Russian ambassador quote. By inadvertently briefed the vice president elect and others with incomplete information regarding my phone calls with the Russian ambassador. Vice president parents took that inaccurate information and repeated it on national television. What I can confirm having spoken him about it is that those conversations that happen to. Occur around the time. That the United States took took action to expelled diplomats. Had nothing whatsoever to do with those sanctions. But that was not true. The Justice Department became aware of fluids lying through routine surveillance of the Russian ambassador. And notified the White House weeks ago. But it wasn't until Friday that Flynn personally apologize to the vice president. The shake up comes at a critical time for president trump. A missile test over the weekend by North Korea. Rising tensions with a Ron. And a key visit Wednesday by Israeli prime minister Bibi Netanyahu to the White House. For the moment retired lieutenant general Keith Kellogg who had been twins' chief of staff will serve as acting national security advisor. Also under consideration as a permanent replacement. Retired General David Petraeus and retired navy seal vice admiral Robert whore word. The search for a replacement a permanent replacement for Flynn begins right now I'm told the General Petraeus will be here at the White House today. But the front runner here seems to be vice admiral Bob horror word. He is somebody who happens also have a very close relationship with general Mattis over at the Pentagon and there have been not a question that the overall running and ask your counsels to.

This transcript has been automatically generated and may not be 100% accurate.

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