Former White House chief strategist Stephen Bannon is worried President Trump would not survive an impeachment vote, according to a report published Wednesday in Vanity Fair.

Bannon and Trump ally Roger Stone both believe establishment Republicans are waiting for a chance to impeach Trump, the magazine reported.

Bannon reportedly believes Trump’s hold on power is slipping in the wake of recent legislative failures. According to Vanity Fair, he recently did a “spitball analysis” of the president’s Cabinet to see who would remain loyal to Trump if the 25th Amendment were invoked, and is unsure if Trump would survive an impeachment vote.

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“One thing Steve wants Trump to do is take this more seriously,” a Bannon confidant told the magazine. “Stop joking around. Stop tweeting.”

Bannon, who has now returned to Breitbart News, has reportedly been pushing Trump to defund special counsel Robert Mueller’s investigation into Russian election meddling and possible collusion between Trump's campaign and Moscow.

The first indictments in Mueller’s probe were unsealed Monday, with charges filed against two former Trump campaign aides and a third aide pleading guilty to lying to the FBI.

Trump took to Twitter to downplay the charges, asking, “Why aren’t Crooked Hillary & the Dems the focus????”