Washington, DC: Stephen Bannon - President Donald Trump's former chief strategist who left the White House in August - declared war on Sunday against the Republican congressional leadership, called on Gary Cohn, Trump's top economic adviser, to resign, and outlined his views on issues ranging from immigration to trade.

Bannon, in a interview on CBS's 60 Minutes, accused Senate Majority Leader Mitch McConnell and House Speaker Paul Ryan of "trying to nullify the 2016 election." It was Bannon's first television interview since leaving the White House and returning as executive chairman to Breitbart News, the conservative website he previously led.

He blamed them for failing to repeal and replace former president Barack Obama's signature health-care law and made clear he would use his Breitbart perch to hold Republicans accountable for not helping Trump push through his agenda.

"They're not going to help you unless they're put on notice," he told CBS's Charlie Rose. "They're going to be held accountable if they do not support the president of the United States. Right now there's no accountability."