President Trump on Thursday again decried the investigation into Russian election meddling, saying Americans are watching "the single greatest WITCH HUNT in American political history."

"You are witnessing the single greatest WITCH HUNT in American political history — led by some very bad and conflicted people! #MAGA," Trump tweeted Thursday, using the hashtag for this campaign slogan, "Make American Great Again."

You are witnessing the single greatest WITCH HUNT in American political history - led by some very bad and conflicted people! #MAGA — Donald J. Trump (@realDonaldTrump) June 15, 2017

Trump has in the past referred to the Russia probe as a witch hunt.

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In a tweet last month — following the naming of a special counsel to lead the Russia investigation — he tweeted: "This is the single greatest witch hunt of a politician in American history."

The president's tweet Thursday follows a report a day earlier that the special counsel named to investigate Russian meddling in the 2016 presidential election is looking into whether Trump obstructed justice.

“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,” Trump tweeted earlier Thursday morning.

The Department of Justice appointed former FBI Director Robert Mueller as special counsel to oversee the Russia probe shortly after Trump's decision to fire former FBI Director James Comey.

Trump claimed — and Comey later affirmed — that Comey assured him he was not personally under FBI investigation. But investigators began probing Trump for obstruction of justice soon after Comey’s termination.

After Comey's testimony last week, further questions were raised about whether Trump tried to obstruct justice.

Thursday's tweets also come after a shooting Wednesday at a congressional baseball practice in Virginia, in which House Majority Whip Steve Scalise (R-La.) was among five wounded. After the shooting, the president called for unity in a statement from the White House.