President Donald Trump’s embattled National Security Adviser Michael Flynn resigned Monday night.

Flynn stepped down after misleading Vice President Mike Pence about the conversations he had with the Russian ambassador before the inauguration.

John Roberts reported tonight that Flynn's worth for the Trump administration was likely outweighed by the distraction he had become after the controversy hit the press.

Krauthammer on Flynn Controversy: Trump 'Loses One Way or Another'

Stoddard: If Flynn Isn’t Fired, Then He’s More Powerful Than Pence

Flynn Apologized to Pence Over Phone Call With Russian Ambassador

Flynn, 58, a retired U.S. Army general, was one of Trump's earliest supporters during the election, and introduced him at several rallies and events.

In a statement, Flynn admitted he inadvertently briefed Pence with incomplete information regarding his discussions with Amb. Sergey Kislyak.

He added that the conversations with Kislyak were meant to "facilitate a smooth transition and begin to build necessary relationships."

Reports over the past few days have stated that there are transcripts of the phone calls and that recent sanctions against Russia by the Obama administration were discussed.

After speaking with Flynn, Pence and Press Secretary Sean Spicer maintained publicly that the sanctions were not discussed.

After Flynn's resignation, Trump named Gen. J. Keith Kellogg the new acting national security adviser.

Kellogg, 72, an Ohio native, served in the Vietnam War, commanded the 82nd Airborne division in the late 1990s and is a recipient of the Silver Star.

Click here for the full text of Flynn's resignation letter. Read more on the story at FoxNews.com.

O'Reilly Rips 'Blatantly Dishonest' Media Coverage of Immigration Raids

Franken Claims Some GOP Senators Are Worried About Trump's Mental State

Dinesh D'Souza: 'Primary Duty' of Government Is to Protect Its Own Citizens