Tonight's resignation comes as somewhat of a surprise as earlier today White House counsel claimed that Flynn enjoyed the “full confidence of the president.”
Flynn's short tenure had been under fire from the beginning as senior US intelligence officials confirmed that Flynn discussed undoing President Obama's sanctions in intercepted telephone conversations with Russian Ambassador Sergei Kislyak.
The resignation comes mere hours after it was learned that the Deputy Attorney General Sally Yates, who was famously fired by Donald Trump for not defending his Muslim ban, informed the White House several weeks ago that she believed Flynn could be subject to blackmail due to his conversations with Kislyak about US sanctions.
Flynn's job security was on shaky ground after it was revealed that he had lied to Vice President Pence, White House counselor Kellyanne Conway and White House Press Secretary Sean Spicer about his communications with that ambassador all of whom repeated the lie on various television news outlets.
Here is the actual letter of resignation Flynn tendered to Trump...
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Trump's choice of Flynn to be his national security advisor had been controversial from the start due to his rampant Islamophobia, being prone to conspiracy theories and his business ties with Russia and Turkey.
*UPDATE : National Security Council's Keith Kellogg has been tapped to replace Michael Flynn. Kellogg was generally known to be Flynn's right-hand man.
In addition rumor has it that the Trump administrations is floating scandal plagued four star general and former Director of the Central Intelligence Agency David Petraeus as Flynn's permanent replacement.