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 Tuesday seized on James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE's recent comments that he's hopeful Democrats will win the 2020 presidential election as evidence that the former FBI director "is and has been a Democrat."

"James Comey just totally exposed his partisan stance by urging his fellow Democrats to take back the White House in 2020," Trump wrote on Twitter. "In other words, he is and has been a Democrat.

"Comey had no right heading the FBI at any time, but especially after his mind exploded!" Trump added.

James Comey just totally exposed his partisan stance by urging his fellow Democrats to take back the White House in 2020. In other words, he is and has been a Democrat. Comey had no right heading the FBI at any time, but especially after his mind exploded! — Donald J. Trump (@realDonaldTrump) December 11, 2018

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In a follow-up tweet, the president quoted Fox News contributor and former FBI special agent Chris Swecker, who asserted that Comey's comments confirm "there is bias in the FBI."

Speaking at an event in New York City on Sunday, Comey said Democrats "have to win" the 2020 presidential election.

"I can tell you that all of us should use every breath we have to make sure the lying stops on Jan. 20, 2021," Comey said, referencing Inauguration Day after the 2020 presidential election.

Comey, who was fired by Trump in May 2017, has clashed with the president since leaving his government job, labeling the president "morally unfit" for office. Comey has said he used to identify as a Republican, but felt the party has left him behind, and urged voters to support Democrats in the midterms.

Some of Comey's defenders and critics have raised questions about whether his comments since leaving the Justice Department border on being too partisan.

Republicans have for months alleged that the Department of Justice, and more specifically the investigation into Russian interference in the 2016 election, is biased against Trump. They have seized on comments from Comey, and anti-Trump text messages sent by former FBI agent Peter Strzok, who previously worked with 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.

Mueller's investigation has thus far implicated five former Trump associates and more than 20 Russian nationals.

Trump has revived his criticism of Comey in the wake of the former FBI director's testimony last week before a pair of House committees, where he shed new light on certain aspects of the investigation into Russian interference, and did not answer or did not recall answers to a number of questions.