Acting White House chief of staff Mick Mulvaney Mick MulvaneyOn The Money: House panel pulls Powell into partisan battles | New York considers hiking taxes on the rich | Treasury: Trump's payroll tax deferral won't hurt Social Security Blockchain trade group names Mick Mulvaney to board Mick Mulvaney to start hedge fund MORE said in a new interview that it was "bad form" for the Republican-controlled Senate Intelligence Committee to subpoena 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 without a "heads up."

“To subpoena the president’s son and not at least get a heads-up is, let’s say, bad form,” Mulvaney told CBS News's "The Takeout" podcast, adding that he learned about its existence shortly before the subpoena was issued.

ADVERTISEMENT

Mulvaney also said he did not know whether the president, who left for Florida Wednesday, had been informed of the subpoena before Mulvaney himself was. Mulvaney added that as acting chief of staff, he was less in the loop about matters involving figures outside the administration.

“I have no opinion about it because he’s a private citizen and not a member of the administration,” he added.

Asked how he reconciled the subpoena with Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellFEC flags McConnell campaign over suspected accounting errors Poll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE’s (R-Ky.) declaration 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’s probe was “case closed,” Mulvaney said Trump and his eldest son are “two different people” and McConnell’s remarks were in reference to questions relating to whether the president colluded with Russia or obstructed justice.

“Now it’s time to move on to the business of government,” Mulvaney said. “Does that mean other individuals may or may have not done other things? I have no idea, but I think that’s what Mr. McConnell was speaking to … there was no reason Mitch McConnell would go to the floor to talk about Don Jr.”

The Hill confirmed the Senate committee's subpoena Wednesday evening.

Trump Jr. testified behind closed doors to the House and Senate intelligence committees in December 2017, with neither committee releasing a transcript of his testimony.

He also testified before the Senate Judiciary Committee in September 2017 on plans to expand his father’s businesses into Russia.

Michael Cohen Michael Dean CohenJudge orders Eric Trump to comply with New York AG's subpoena before Election Day A huge deal for campaign disclosure: Trump's tax records for Biden's medical records Our Constitution is under attack by Attorney General William Barr MORE, the president’s former personal attorney, told the House Oversight and Reform Committee earlier this year that the younger Trump was far more involved in the project than his testimony indicated.