Former White House chief strategist Steve Bannon said Republican establishment figures, including Senate Majority Leader Mitch McConnell, R-Ky., and Speaker of the House Paul Ryan, R-Wis., are trying to "nullify the 2016 election."

"The Republican establishment is trying to nullify the 2016 election," Bannon said in an interview with CBS's "60 Minutes" in a clip released Thursday. "That's a brutal fact we have to face."

Host Charlie Rose pressed him and asked who was trying to nullify the 2016 election.

"I think Mitch McConnell, and to a degree, Paul Ryan," Bannon said. "They do not want Donald Trump's populist, economic nationalist agenda to be implemented. It's very obvious."

Rose prompted Bannon to share a story supporting this. Bannon shared that McConnell told him in one of their first meetings at Trump Tower to stop talking about "draining the swamp" -- a term embraced by Trump during the campaign.

"He says, ‘I can't -- I can't hire any smart people,' because everybody's all over him for reporting requirements and the pay, et cetera, and the scrutiny," Bannon said. "You know, ‘You gotta back off that.' The ‘Drain the Swamp' thing was -- is Mitch McConnell was day one did not wanna -- did not wanna go there. Wanted us to back off."

Rose said Bannon was attacking people he needed help from in order to get things accomplished in Washington.

Bannon replied that no one would help unless they are put on notice. He said there was no accountability and no one was supporting Trump's agenda.

"And so therefore, now that you're out of the White House, you're going to war with them?" Rose asked.

"Absolutely," Bannon responded.

Bannon left his position as White House chief strategist in August and rejoined Breitbart News.