Retired three-star Army general Michael Flynn, who for 33 years in uniform swore to support and defend the Constitution of the United States against all enemies foreign and domestic, pled guilty Friday morning to lying to the FBI about his attempts at secret policy coordination with the Russian ambassador to the U.S. in 2016. The move could trigger a major unraveling of the United States’ Donald Trump revolution.

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Flynn’s federal guilty plea appears to be part of a deal with Special Counsel Robert Mueller to tell investigators all he knows about Russian coordination, and possibly more, by members of the Trump campaign, the Trump White House, and perhaps even President Donald Trump himself.

“The actions I acknowledged in court today were wrong, and, through my faith in God, I am working to set things right,” Flynn said in a statement released through his attorney after the court appearance. “My guilty plea and agreement to cooperate with the Special Counsel’s Office reflect a decision I made in the best interests of my family and country.” Flynn previously gained fame for popularizing the anti-Hillary Clinton catchphrase “Lock her up!” over what he called her poor handling of classified information.

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In a few short years, Flynn went from being the Pentagon’s chief intelligence, to a member of Trump’s inner campaign circle and a purveyor of laughable anti-Democrat conspiracy theories like a (nonexistent) sex-trafficking ring run out of a Washington pizza parlor. After Trump’s inauguration, Flynn was named national security advisor.

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In the meantime, however, he’d secretly done lobbying for Turkey’s repressive president, taken massive payments for cooperating with Russian state media, and had multiple contacts with Russian officials even before his abortive, 24-day stint on the White House payroll.

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It was those contacts that boxed Flynn into his quick court appearance Friday. Threatened with a host of serious charges that could take down him along with his cantankerous son and personal aide, Michael Flynn Jr., the elder Flynn agreed to plead guilty to concealing what he’d asked Russian Ambassador Sergey Kislyak for in December 2016, before Trump had even taken office.

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Specifically, Flynn asked Kislyak to ensure that Russia wouldn’t retaliate against the U.S. after the outgoing Obama administration imposed tough sanctions on the former Cold War foe over its interference in Trump’s presidential election. Kislyak said the Russian government would abide by Flynn’s request.

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Flynn concealed that conversation from FBI investigators, along with another request Kislyak had fulfilled for him — probably because he recognized they constituted illegal conduct of foreign policy by someone who wasn’t even in the U.S. government yet. And now he admits he did it.

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What does that mean for President Trump? Potentially a lot. It’s not clear what Flynn knows. He has regularly proven not quite the intellectual powerhouse he considers himself to be. But plenty of observers note that the day after that 2016 Flynn-Kislyak chat about sanctions — which, again, Flynn concealed from FBI investigators, and supposedly lied to Mike Pence about — President-Elect Trump was jubilantly tweeting that Russian President Vladimir Putin was doing the right thing in response:

So it all comes back, again, to what the president knew and when he knew it. Plus all the other people around the president. Who, evidently, did not take the Flynn news well:

But soon enough, White House officials were back in true form with the kind of talking point that seems like a self-own:

Meanwhile, uniformed personnel at the Pentagon, Flynn’s old haunt, looked at his plea very differently from the political players at 1600 Pennsylvania Avenue: