Former White House chief strategist Stephen Bannon said Saturday that President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE will "win with 400 electoral votes in 2020," following reports that he had lost faith in the president's ability to complete his current term.

"The populist, nationalist, conservative revolt that's going on, that drove Donald Trump to victory, that drove Judge [Roy] Moore to victory, that will drive 15 candidates to victory in 2018, and I hate to break it Graydon Carter and the good folks at Vanity Fair, but yes, President Trump is not only going to finish this term, he's going to win with 400 electoral votes in 2020," Bannon said during a speech at the Values Voter Summit in Washington.

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Bannon reportedly said several months ago that Trump only has a 30 percent chance of finishing his current term, a source told Vanity Fair, who said the president also did not know the function of the 25th Amendment, which allows a majority of the Cabinet to vote for the president to be removed from office.

Bannon returned to the far-right Breitbart News outlet after leaving the White House in August. The former Trump strategist said he left his post to be a "wingman outside" the White House for Trump to help advance the president's agenda.

In his speech Saturday, Bannon also committed that he would "get to the progressive Democrats," but said that "right now it's a season of war against the GOP establishment."

Bannon laid out his plans to back challengers to establishment Republicans in Congress for the 2018 midterm elections in an interview earlier this week.

"There's a coalition coming together that is going to challenge every Republican incumbent except for Ted Cruz Rafael (Ted) Edward CruzVideo of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Democrat on Graham video urging people to 'use my words against me': 'Done' MORE," Bannon told Fox News's Sean Hannity on Monday.

Bannon rallied for former judge Roy Moore in Alabama's Senate GOP runoff last month. Moore defeated Sen. Luther Strange Luther Johnson StrangeSessions hits back at Trump days ahead of Alabama Senate runoff The biggest political upsets of the decade State 'certificate of need' laws need to go MORE, who was endorsed by Trump and congressional Republicans.

Trump surpassed the necessary 270 electoral votes in the Electoral College to defeat Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE in the 2016 presidential election. Trump won 304 electoral votes to Hillary Clinton's 227.