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 accused Democrats of seeking a "do-over" of the special counsel's investigation into Russian interference, defending his decision to tell former White House counsel Don McGahn to defy a House Judiciary Committee subpoena.

"So even though I didn’t have to do it with Presidential Privilege, I allowed everyone to testify, including White House Counsel Don McGahn (for over 30 hours), to 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 and the 18 Angry Trump-Hating Democrats, and they arrived at a conclusion of NO COLLUSION and NO OBSTRUCTION!" Trump tweeted.

....at a conclusion of NO COLLUSION and NO OBSTRUCTION! The Dems were unhappy with the outcome of the $40M Mueller Report, so now they want a do-over. — Donald J. Trump (@realDonaldTrump) May 21, 2019

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Mueller found that he could not establish a conspiracy between the Trump campaign and the Russian government. He did not make a determination on obstruction of justice, instead leaving it up to Congress to further investigate the matter. The attorney general and deputy attorney general determined there was not sufficient evidence to charge Trump with obstruction.

Roughly an hour before Trump's tweet, House Judiciary Committee Chairman Jerrold Nadler Jerrold (Jerry) Lewis NadlerDemocrats shoot down talk of expanding Supreme Court Schumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-N.Y.) issued subpoenas to Annie Donaldson, who served as chief of staff to McGahn, and former White House communications director Hope Hicks Hope Charlotte HicksSenate intel leaders said Trump associates may have presented misleading testimony during Russia probe: report Cuomo turned down Trump invitation to participate in April press briefing: report Trump shakes up White House communications team MORE, one of Trump's longest-serving aides in the West Wing and an ally dating back to the 2016 campaign.

The Judiciary Committee opened the day by holding a hearing for McGahn, who skipped the opportunity to testify after the White House encouraged him to do so.

The president has in recent days accused Democrats of wanting a "redo" or a "do-over" of the Mueller investigation. Democrats in the House have subpoenaed multiple former White House officials for testimony and documents, but the White House has consistently rebuffed their efforts to get documentation or testimony from the White House.

Trump has argued his cooperation with the Mueller investigation was sufficient. Hicks, McGahn and Donaldson each spoke with investigators from the special counsel's office.

The White House's refusal to cooperate with Democratic oversight efforts has led to fresh calls from some party members to begin impeachment proceedings.