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 said Tuesday it was “very unfair” for the Republican-led Senate Intelligence Committee to subpoena his eldest son, Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE, to testify for a second time about Russian interference in the 2016 election.

“It’s really a tough situation because my son spent I guess over 20 hours testifying about something that [special counsel Robert] Mueller said was 100 percent OK,” Trump told reporters at the White House. “And now they want him to testify again. I don’t know why. I have no idea why. But it seems very unfair to me."

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The comments marked Trump’s strongest criticism to date of the subpoena, which was the first issued to one of his children and drew the ire of other GOP lawmakers who said it is time to move on from the Russia probe.

Trump said last Thursday that he was “very surprised” to learn of the subpoena and defended his son as a “good person” who “works very hard” and would be distracted by having to testify again.

The Intelligence Committee, led by Sen. Richard Burr Richard Mauze BurrRep. Mark Walker says he's been contacted about Liberty University vacancy Overnight Defense: Trump rejects major cut to military health care | Senate report says Trump campaign's Russia contacts posed 'grave' threat Senate report describes closer ties between 2016 Trump campaign, Russia MORE (R-N.C.), reportedly subpoenaed Trump Jr. because he backed out of two previously scheduled voluntary interviews.

Senators on the committee want to follow up on their 2017 interview of the president’s oldest son regarding the June 2016 Trump Tower meeting in New York and the push to build a Trump Tower in Moscow.