Joel Pollak, a senior editor-at-large for Breitbart News, says conservatives are likely to stand behind President Trump as long as Vice President Pence is "on board."

"I think the conservative base trusts Mike Pence Michael (Mike) Richard PenceMcConnell locks down key GOP votes in Supreme Court fight Momentum growing among Republicans for Supreme Court vote before Election Day Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election MORE more than almost anybody else in Washington," Pollak told MSNBC's Chuck Todd on Friday.

"And so as long as he is part of the discussion, as long as he is on board and in the room and helping to make decisions, I think you'll see conservatives stick with this president," he declared.

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Pollak's prediction came hours after the departure from the White House of chief strategist Steve Bannon, the former executive chair of Breitbart who quickly rejoined the right-wing news outlet on Friday.

Bannon, who joined Trump's presidential campaign last August as chief executive, was widely seen as a driving force behind the president's populist-nationalist agenda.

But news of Bannon's departure on Friday stirred concern among Breitbart personnel, including Pollak, who tweeted "#WAR" shortly after.

He later explained on CNBC's "Power Lunch" that he meant the news outlet would continue to fight for "the movement and the ideas that brought Trump to office."

But he also voiced concern that Trump's campaign promises could be moderated in the absence of Bannon.

"Whether he remains onboard with that agenda is now an open question with Steve Bannon's departure from the White House," Pollak said.