President Trump is said to have known about the discrepancies in former national security adviser Michael Flynn's account of his communications with the Russian ambassador for weeks.
According to the Washington Post, White House press secretary Sean Spicer said that Trump and top aides were informed of the allegations on January 26.
Spicer is quoted as saying, "We've been reviewing and evaluating this issue with respect to General Flynn on a daily basis for a few weeks, trying to ascertain the truth."
He also told the press, "The evolving and eroding level of trust as a result of this situation and a series of other questionable instances is what led the president to ask General Flynn for his resignation."
Spicer then added, "There's nothing that the general did that was a violation of any sort. What this came down to was a matter of trust."
Possible replacements for Michael Flynn
Possible replacements for Michael Flynn
Retired Gen. David Petraeus
Retired Gen. David Petraeus' career includes 37 years of service in the US Army and a role as Director of the Central Intelligence Agency.
In addition to commanding the entire coalition force in Iraq, the four-star general headed US Central Command (CENTCOM), which oversees all operations in Middle East.
Petraeus was briefly considered for Secretary of State by the Trump administration.
Stephen J. Hadley
Stephen Hadley served as the National Security Adviser to President George W. Bush from 2005 to 2009.
He served on several advisory boards, including defense firm Raytheon, and RAND's Center for Middle East Public Policy. Together with former Secretary of State Condoleezza Rice and former Secretary of Defense Robert Gates, he helps head the international strategic consulting firm, RiceHadleyGates LLC.
He also wrote the "The Role and Importance of the National Security Advisor," which, as the title implies, is an in-depth study of the National Security Adviser's role.
Retired Gen. Keith Kellogg
As the interim National Security Adviser filling in for Michael Flynn, retired Lt. Gen. Keith Kellogg was the chief of staff for the Trump administration's National Security Council (NSC).
Prior to that, he worked in the Joint Chiefs of Staff office and was part of computer software giant Oracle's homeland security team.
Tom Bossert, a cybersecurity expert, serves as the Homeland Security Adviser in the White House.
The former Deputy Homeland Security Adviser to President George W. Bush co-authored the 2007 National Strategy for Homeland Security, the government’s security policies established after the 9/11 terror attacks.
In a 2015 column in The Washington Times, Bossert seemed to defend the wars in Iraq and Afghanistan by writing, "To be clear, the use of military force against Iraq and Afghanistan was and remains just ... The use of force in Iraq was just and, at the time, necessary, even if Mr. Obama disagrees with how things went."
Retired Vice Adm. Robert S. Harward
Retired Vice Adm. Robert S. Harward is a US Navy SEAL and the former Deputy Commander of US Central Command (CENTCOM).
He served as the commander of SEAL Team 3 and was the Deputy Commanding General of Joint Special Operations Command (JSOC). Harward also served on the National Security Council as the Director of Strategy and Policy for the Office of Combating Terrorism, and is also the CEO for Lockheed Martin in the United Arab Emirates.
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However, the Post points out, "The comments contrast with the impression given by Trump on Friday aboard Air Force One that he was not familiar with a Washington Post report that revealed that Flynn had not told the truth about the calls."
The president said at the time, "I don't know about that. I haven't seen it. What report is that? I haven't seen that. I'll look into that."
Democrats are asking for a full investigation into the matter, with House Minority Leader Nancy Pelosi saying, "Flynn's resignation is a reflection of the poor judgment of President Trump and demands answers to the grave questions over the president's involvement. By what authority did Flynn act and to whom did he report?"
On Monday night, Flynn resigned as national security adviser amid reports that the Justice Department had warned weeks ago that he could be subject to blackmail over his contact with Russian officials, notes CNN.