WATCH: Fox News' Shep Smith calls out Sarah Sanders for lying about Russian collusion during frantic press conference

Just moments after White House Press Secretary Sarah Huckabee Sanders concluded an attenuated press briefing, Fox News' Shep Smith immediately called her out for promoting a falsehood when discussing Russian involvement in the 2016 election.

Sanders was asked about the President's tweet about H.R. McMaster that inferred the national security adviser forgot to say that the Russians didn't impact the election. Sander's quickly responded that Trump is a fan of McMaster and that the president thought that "little addendum" about no collusion would be "helpful to add."

Sanders then bolted from the lecture as reporters shouted more questions at her.

"That addendum would have made that inaccurate," Smith told his Fox viewers.

"A couple of things," Smith said. "Sarah Sanders went on to say that Sanders said we know from the Russian indictment that there is no collusion -- that is not true. The collusion, according to a Fox News investigation, is a separate investigation and there was no mention of that."

"The White House is trying to say it's incontrovertible the Russian meddling had no impact on the election, that is not true, it's an open matter," He added.

Watch the video below via Twitter:

Shep immediately after the press briefing: 'A couple of things ... Sanders said we know there is no collusion, that is not true ... The White House is trying to say it's incontrovertible the Russian meddling had no impact on the election, that is not true, it's an open matter.' pic.twitter.com/SN5URLxBB7

— Lis Power (@LisPower1) February 20, 2018