President Donald Trump admitted to being under investigation Friday, in a perplexing tweet that assigned blame for the investigation to “the man who told me to fire the FBI Director.”

I am being investigated for firing the FBI Director by the man who told me to fire the FBI Director! Witch Hunt — Donald J. Trump (@realDonaldTrump) June 16, 2017

It is unclear to whom Trump is referring: Deputy Attorney General Rod Rosenstein and Attorney General Jeff Sessions wrote memos supportive of ousted FBI Director James Comey’s firing. Trump himself said after the firing that he had made up his mind to fire Comey regardless of Sessions’ and Rosenstein’s arguments.

Rosenstein also chose special counsel Robert Mueller to lead the federal investigation into Russian meddling into the 2016 investigation, including possible collusion or coordination with Trump associates.

In his letter to Comey announcing his firing on May 9, Trump thanked the ousted FBI Director for “informing me, on three separate occasions, that I am not under investigation.” Comey confirmed in sworn testimony to the Senate Intelligence Committee on June 8 that he had told Trump he was not under investigation — a point Trump celebrated loudly after Comey’s testimony.

On Wednesday, the Washington Post reported that Mueller’s probe expanded to include possible obstruction of justice by Trump days after Comey’s firing.

On Thursday, Trump hinted at the reported investigation being mounted against him:

They made up a phony collusion with the Russians story, found zero proof, so now they go for obstruction of justice on the phony story. Nice — Donald J. Trump (@realDonaldTrump) June 15, 2017

Why is that Hillary Clintons family and Dems dealings with Russia are not looked at, but my non-dealings are? — Donald J. Trump (@realDonaldTrump) June 15, 2017

Crooked H destroyed phones w/ hammer, 'bleached' emails, & had husband meet w/AG days before she was cleared- & they talk about obstruction? — Donald J. Trump (@realDonaldTrump) June 15, 2017

This post has been updated.