Former White House chief strategist Stephen Bannon said in an interview broadcast Sunday that he has "zero" doubt that President TrumpDonald John TrumpAlaska Republican Party cancels 2020 primary Ukrainian official denies Trump pressured president Trump goes after New York Times, Washington Post: 'They have gone totally CRAZY!!!!' MORE will run for reelection in 2020, but cautioned the release of the special counsel's report could shake up the political landscape.

"I happen to think now, the president is going to run again in 2020 and I think he'll win. I think he'll win bigger than he won in 2016," Bannon said on CBS's "Face the Nation," citing the strong economy.

"But ... I believe that we're going to enter into an extraordinary time in American politics," he added. "We've allowed the Democrats, because they take control of the House, to weaponize a whole bunch of investigations. They’ve been — They're going to be able to weaponize the Mueller report, 2019 is going to be quite vitriolic."

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Trump has given every indication he plans to run for reelection in 2020. He held his first campaign rally of 2019 in El Paso, Texas, earlier this month, and has tweeted regularly about Democratic efforts to unseat him next year.

A steadily growing field of Democratic challengers has taken shape in recent weeks. Among those who have declared their candidacy or formed exploratory committees are Sens. Kamala HarrisKamala Devi HarrisWarren overtakes Biden in Iowa for first time: poll Iowa GOP swipes at 2020 Democrats' meat positions as candidates attend annual Steak Fry Warren avoids attacks while building momentum MORE (D-Calif.), Elizabeth WarrenElizabeth Ann WarrenWarren overtakes Biden in Iowa for first time: poll Warren avoids attacks while building momentum Sanders unveils plan to eliminate Americans' medical debt MORE (D-Mass.), Bernie SandersBernie SandersWarren overtakes Biden in Iowa for first time: poll The polls are asking the wrong question Sanders unveils plan to eliminate Americans' medical debt MORE (I-Vt.), Cory BookerCory Anthony BookerIowa GOP swipes at 2020 Democrats' meat positions as candidates attend annual Steak Fry Booker aide sounds alarm about campaign's funding 2020 Democrats defend climate priorities in MSNBC forum MORE (D-N.J.), Kirsten GillibrandKirsten GillibrandBooker aide sounds alarm about campaign's funding O'Rourke gun confiscation talk alarms Democrats Gillibrand relaunches PAC to elect women MORE (D-N.Y.) and Amy KlobucharAmy Jean KlobucharMSNBC 'Climate in Crisis' special draws 1.3M viewers in 8 pm timeslot The two most important mental health reforms the Trump administration should consider Sanders searches for answers amid Warren steamroller MORE (D-Minn.).

Former Vice President Joe BidenJoe BidenUkrainian official denies Trump pressured president Trump goes after New York Times, Washington Post: 'They have gone totally CRAZY!!!!' Warren overtakes Biden in Iowa for first time: poll MORE and former Rep. Beto O'RourkeBeto O'RourkeO'Rourke gun confiscation talk alarms Democrats NRA deems O'Rourke 'Salesman of the Month' after Arizona gun store sells out of AR-15s during 'Beto Special' MSNBC 'Climate in Crisis' special draws 1.3M viewers in 8 pm timeslot MORE (D-Texas) are among those expected to decide on a 2020 bid in the coming weeks.

Bannon, who served in a top role on Trump's 2016 campaign, left the White House in the summer of 2017. He and Trump later had a falling out after Bannon was quoted extensively in the book "Fire and Fury: Inside the Trump White House," including instances in which he criticized the president's family.