Trump is apparently very anxious about Robert Mueller. He may have good reason to be.

As President Trump's "West Wing careens through one of the most turbulent weeks of his presidency, White House officials are struggling to understand the source of the fury fueling the president's eruptions," Vanity Fair reported Wednesday, quoting a former West Wing staffer: "This is a level of insanity I've never seen before." But Trump's "oddly detailed condemnation" of Special Counsel Robert Mueller on Twitter Thursday bolsters the speculation that Trump's mood is tied to the Russia investigation, Politico reports.

"Half a dozen people in contact with the White House and other Trump officials say a deep anxiety has started to set in that Mueller is about to pounce after his self-imposed quiet period, and that any number of Trump's allies and family members may soon be staring down the barrel of an indictment," Politico says. Trump and his lawyers have been meeting this week to answer Mueller's questions about Russia's Trump-friendly interference in the 2016 election. But Trump's "unusually specific" accusations against Mueller suggest the cause of his anxiety is based on specific knowledge, Natasha Bertrand reports at The Atlantic.

Trump's angry tweets "could just be another rant," former Manhattan federal prosecutor Elie Honig tells Bertrand. But Trump allies may also have informed Trump that Mueller's prosecutors are getting impatient with a less-than-forthcoming witness. "My hunch is that prosecutors had some sort of 'Time to get real' conversation with someone implicated in the investigation, which was then relayed to Trump by defense attorneys," Honig said. Fellow former federal prosecutor Dan Goldman agreed, saying he believes "indictments are coming," maybe Friday.

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"You can see it in Trump's body language all week long, there's something troubling him," a senior Republican official in touch with the White House speculates to Politico. "It led me to believe the walls are closing in and they've been notified by counsel of some actions about to happen. Folks are preparing for the worst."