Vice President Mike Pence Michael (Mike) Richard PenceGOP short of votes on Trump's controversial Fed pick Pence seeks to boost Daines in critical Montana Senate race The Hill's Campaign Report: Trump's rally risk | Biden ramps up legal team | Biden hits Trump over climate policy MORE did not learn about the Justice Department warning regarding former National Security Adviser Michael Flynn until 15 days after President Trump, NBC News reported.

Flynn resigned late Monday, amid revelations he had discussed sanctions against Russia with the country’s ambassador Sergey Kislyak during the transition. Pence and other Trump administration officials previously denied that Flynn had done so, with the vice president defending the national security advisor on CBS in January.

Flynn revealed in his resignation letter that he had briefed Pence and other officials with “incomplete information" and apologized to Pence and Trump for misleading them.

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Late last month, then-acting Attorney General Sally Yates sent a message to the White House expressing concern that Flynn could be vulnerable to blackmail by the Kremlin because of discrepancies between his account of his conversation with Kislyak and what intelligence officials knew of the phone calls.

White House Press Secretary Sean Spicer confirmed during his daily briefing on Tuesday that Trump had known that Flynn had misled some White House officials for weeks, and forced the senior aide to resign because of an “evolving and eroding level of trust.” But Pence was not briefed until Feb. 9, NBC said.

“The president was very concerned that General Flynn had misled the vice president and others,” Spicer said. “The president must have complete and unwavering trust of the person in that position.”

Pence was allegedly angered by reports that the former national security advisor had misled him.

Flynn had apparently been communicating with Kislyak in the months before Trump took office, including contact on Dec. 29, the same day former President Barack Obama Barack Hussein ObamaGOP senator blocks Schumer resolution aimed at Biden probe as tensions run high D-Day for Trump: September 29 Obama says making a voting plan is part of 'how to quarantine successfully' MORE imposed fresh sanctions on Russia for interfering in the 2016 presidential election. The communications were first reported by The Washington Post.

Updated 6:44 p.m.