President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE on Sunday called a Fox News show "MANDATORY watching" for people seeking to understand "the massive governmental corruption and the Russian Hoax."

"Just watched Sunday Morning Futures with @MariaBartiromo on @FoxNews. This show is MANDATORY watching if you want to understand the massive governmental corruption and the Russian Hoax," he wrote on Twitter. "It will be rebroadcast this evening at 6:00 P.M. on @FoxBusiness. A must see!"

Just watched Sunday Morning Futures with @MariaBartiromo on @FoxNews. This show is MANDATORY watching if you want to understand the massive governmental corruption and the Russian Hoax. It will be rebroadcast this evening at 6:00 P.M. on @FoxBusiness. A must see! — Donald J. Trump (@realDonaldTrump) September 16, 2018

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Trump's tweet was his latest attack on special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's investigation into Russian interference in the 2016 election and possible collusion between the Trump campaign and Moscow.

In a tweet earlier Sunday, Trump revisited his charge that the "Mueller Witch Hunt" is illegal.

"The illegal Mueller Witch Hunt continues in search of a crime. There was never Collusion with Russia, except by the Clinton campaign, so the 17 Angry Democrats are looking at anything they can find. Very unfair and BAD for the country. ALSO, not allowed under the LAW!" he said.

The illegal Mueller Witch Hunt continues in search of a crime. There was never Collusion with Russia, except by the Clinton campaign, so the 17 Angry Democrats are looking at anything they can find. Very unfair and BAD for the country. ALSO, not allowed under the LAW! — Donald J. Trump (@realDonaldTrump) September 16, 2018

Trump has frequently sought to discredit the special counsel and has often described the investigation as a "hoax" and a "witch hunt" even as his own intelligence officials have said that Russia meddled in the 2016 election.

Trump's former campaign manager, Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE, last week became the latest former Trump associate to agree to cooperate with the special counsel in the investigation. Manafort pleaded guilty to two federal charges Friday as part of a cooperation agreement with investigators. He had earlier been convicted of eight charges in a separate trial in Virginia.

Other former associates of Trump that have agreed to cooperate with the special counsel include former campaign adviser George PapadopoulosGeorge Demetrios PapadopoulosTale of two FBI cases: Clinton got warned, Trump got investigated Trump says he would consider pardons for those implicated in Mueller investigation New FBI document confirms the Trump campaign was investigated without justification MORE, former national security adviser Michael Flynn and former deputy campaign chairman Richard Gates.

Trump often praises Fox News and its coverage of him while blasting competitors like CNN as "fake news."