President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE on Sunday renewed his accusations that 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 has "conflicts of interest" in his investigation of Russian interference in the 2016 presidential election, citing a previous business dispute between the two men.

In a series of tweets attacking the special counsel's credibility, Trump noted that he and Mueller had "a very nasty & contentious business relationship."

Is Robert Mueller ever going to release his conflicts of interest with respect to President Trump, including the fact that we had a very nasty & contentious business relationship, I turned him down to head the FBI (one day before appointment as S.C.) & Comey is his close friend.. — Donald J. Trump (@realDonaldTrump) July 29, 2018

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Trump has alleged on multiple occasions via Twitter that Mueller has unspecified conflicts of interest, but Sunday's tweet marks the first time he's elaborated beyond such accusations.

The president seemingly confirmed a New York Times report from January that said Trump attempted to fire Mueller in June 2017 over alleged conflicts of interest.

The Times reported that Trump listed three conflicts he believed should disqualify Mueller: A dispute over fees at Trump’s National Golf Club in Virginia; his interview for FBI director before being named special counsel; and Mueller’s previous employment at a law firm that represents Trump’s son-in-law, Jared Kushner Jared Corey KushnerAbraham Accords: New hope for peace in Middle East Tenants in Kushner building file lawsuit alleging dangerous living conditions Trump hosts Israel, UAE, Bahrain for historic signing MORE.

Trump reportedly backed off his demand after White House counsel Don McGahn refused Trump’s order and threatened to quit.

Multiple reports indicated Trump interviewed Mueller for the vacancy, but it's unclear if Trump turned him down for the position before he was named special counsel in May 2017.

Trump's accusations about Mueller's alleged conflicts of interest came amid a string of tweets in which he claimed the special counsel's team is filled with Democrats.

Trump also claimed Mueller's probe was sparked by the so-called Steele dossier and questioned why the special counsel was not investigating Democrats.

The Mueller probe was launched by Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE, a Trump appointee, days after the president fired former FBI Director James Comey James Brien ComeySteele Dossier sub-source was subject of FBI counterintelligence probe Judge will not dismiss McCabe's case against DOJ Democrats fear Russia interference could spoil bid to retake Senate MORE and said it was because of the Russia investigation, actions that drew allegations that he was seeking to obstruct the FBI's investigation of Russian interference in the 2016 election.

....Also, why is Mueller only appointing Angry Dems, some of whom have worked for Crooked Hillary, others, including himself, have worked for Obama....And why isn’t Mueller looking at all of the criminal activity & real Russian Collusion on the Democrats side-Podesta, Dossier? — Donald J. Trump (@realDonaldTrump) July 29, 2018

There is No Collusion! The Robert Mueller Rigged Witch Hunt, headed now by 17 (increased from 13, including an Obama White House lawyer) Angry Democrats, was started by a fraudulent Dossier, paid for by Crooked Hillary and the DNC. Therefore, the Witch Hunt is an illegal Scam! — Donald J. Trump (@realDonaldTrump) July 29, 2018

The president has attacked Mueller's investigation with increasing regularity in recent months, frequently decrying it as a "witch hunt" and a "hoax" in an attempt to discredit Mueller and his probe.

The special counsel has thus far indicted more than 20 Russian nationals as part of his probe. He has also indicted three Russian companies and several former Trump advisers.

Former Trump campaign chairman 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 is set to go on trial this week as part of the investigation.