Former White House chief strategist Steve Bannon accused the GOP Establishment of “trying to nullify the 2016 election” and undermine President Donald Trump’s agenda, speaking during an interview that aired Sunday evening on CBS News’ “60 Minutes.”

Bannon, who left his position at the White House on August 18, sat down with CBS News’ Charlie Rose to discuss how the Trump administration will most likely move forward after his exit. As a representative of the conservative-populist wave that elected Trump, Bannon’s ouster from the White House was viewed with alarm by many among the president’s loyal base.

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The former strategist railed against the Trump White House in his interview, telling Rose “the original sin of the administration” was its decision early on to “embrace” the GOP Establishment that either spurned Trump’s candidacy entirely or reluctantly supported his presidential bid.

“In the 48 hours after we won, there’s a fundamental decision that was made. You might call it the original sin of the administration. We embraced the Establishment. I mean, we totally embraced the Establishment,” Bannon said, adding that Trump told him, “Hey, I’ve gotta put together a government. I’ve gotta really staff up something. I need to embrace the Establishment.”

“The Republican Establishment is trying to nullify the 2016 election. That’s a brutal fact we have to face,” he warned.

Bannon blasted Senate Majority Leader Mitch McConnell (R-Ky.) and House Speaker Paul Ryan (R-Wis.) over their failures to successfully put key pieces of legislation on Trump’s desk to sign during his first several months in office.

When Rose asked Bannon who in particular from the GOP Establishment was trying to “nullify” the 2016 election, Bannon pointed to McConnell and Ryan.

“They do not want Donald Trump’s populist, economic nationalist agenda to be implemented. It’s very obvious,” Bannon said. “Oh, Mitch McConnell, when we first met him … he said, I think in one of the first meetings — in Trump Tower with the president — as we’re wrapping up, he basically says, ‘I don’t wanna hear any more of this ‘drain the swamp’ talk.'”

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“Drain the swamp” — one of Trump’s most iconic campaign promises — will take more time to orchestrate than the president may have realized, Bannon said.

“The swamp is 50 years in the making,” he said, “the permanent political class, as represented by both parties. You’re not gonna — you’re not gonna drain that in eight months. You’re not gonna drain it in two terms. This is gonna take 10, 15, 20 years of relentlessly going after it.”

Claiming that the GOP at large was unwilling to go along with “draining the swamp” and bringing accountability back into Washington, D.C., Bannon said that Republicans are “not gonna help [Trump] unless they’re put on notice.” This is why, the former strategist implied, the president has been so vocal in his criticisms of his own party — both verbally and on Twitter — for failing to repeal and replace Obamacare and for failing to place key legislative items on his desk.

“They’re gonna be held accountable if they do not support the president of the United States. Right now there’s no accountability,” he added. “They have totally — they do not support the president’s program. It’s an open secret on Capitol Hill. Everybody in this city knows it.”