President Donald Trump on Thursday appeared to threaten to fire special counsel Robert Mueller’s team of investigators — or perhaps Mueller himself — in his latest tweet attacking the probe into Russian election meddling and potential collusion with his campaign.

“This is an illegally brought Rigged Witch Hunt run by people who are totally corrupt and/or conflicted. It was started and paid for by Crooked Hillary and the Democrats. Phony Dossier, FISA disgrace and so many lying and dishonest people already fired. 17 Angry Dems? Stay tuned!” he tweeted.

While the meaning of “Stay tuned!” was not immediately clear, the conservative media websites Daily Caller and Breitbart speculated that it meant that Mueller — a Republican appointed by a Republican — or members of his team could be toast.

“Donald Trump: ‘Stay Tuned’ Whether Democrats on Russia Investigation Will Be Fired,” the lead headline on Breitbart read shortly after Trump’s tweet.

Several of the special counsel’s investigators had donated to Hillary Clinton’s campaign, leading to Trump’s accusations of bias.

Trump’s attacks on Mueller have intensified in recent weeks as his former campaign chairman Paul Manafort has been on trial in a federal courtroom in Virginia on corruption charges.

The president is also worried that his son Donald Jr. could face legal trouble for meeting with a Kremlin-connected Russian lawyer looking to dish dirt on Clinton, the Washington Post reported.

Trump angrily denied the report that said he was worried about Donald Jr., whom he called “my wonderful son.”

Trump lawyers Rudy Giuliani and Jay Sekulow have also ramped up their attacks on Mueller, who is seeking an interview with the president.