Questions swirl after it emerges Trump told weeks ago that Flynn misled over Russia calls

The timing and notification of key administration figures remains unclear.

Flynn wrote in his resignation letter that he "inadvertently briefed the Vice President-elect and others with incomplete information regarding my phone calls with the Russian Ambassador," but questions about the legality of the calls remain at large.

Crucial questions

Flynn later said that he "can't be certain" if sanctions were brought up in the conversations.

It wasn't until Friday, Feb. 10, that Flynn apologized to Pence and other officials for misleading them about the details of his discussion with the Russian ambassador, sources told ABC News.

After Trump was reportedly told about the situation on Jan. 26, there was a roughly three week period between the time the Justice Department notified the White House and when Flynn apologized to Pence and other officials. During that time, no efforts were made to correct or clarify Pence's statements about Flynn's conversations with the ambassador.

Spicer explained to reporters Tuesday that the delay was due in part because the president had asked the White House counsel to review the situation and see if there was a legal issue with Flynn's actions. Spicer said the White House counsel determined there was not.

Spicer said today that Trump was referring specifically to the Washington Post's initial report on the story.

"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 for General Flynn’s resignation," Spicer said.

Spicer did not clarify what other "questionable instances" contributed to the president's decision.

"Obviously there's an administration that is in significant disarray as far as national security is concerned and they need to fix that," he said.

ABC News' Pierre Thomas and Jonathan Karl contributed to this report.