Former President Carter said that choosing John Bolton as national security adviser has been President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE’s "worst mistake" in office so far.

“I have been concerned at some of the things he's decided. I think his last choice for national security adviser was very ill-advised. I think John Bolton has been the worst mistake he's made,” Carter told “CBS This Morning” co-host Norah O'Donnell on Monday.

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Bolton, who served as President George W. Bush's ambassador to the United Nations, is a controversial figure even among Republicans. He has heavily criticized the Iran nuclear deal and advocated for a preemptive strike against North Korea. He also continues to be supportive of having gone to war in Iraq and called for expanding the war into Iran.

Bolton will replace H.R. McMaster next month, becoming Trump’s third national security adviser since he took office.

In recent weeks a number of officials viewed as moderate forces in the White House — including economic adviser Gary Cohn Gary David CohnGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Former national economic council director: I agree with 50 percent of House Democrats' HEROES Act MORE and Secretary of State Rex Tillerson Rex Wayne TillersonGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Conspicuous by their absence from the Republican Convention MORE — have left the administration.

Carter, who is promoting his new book "Faith: A Journey for All," said on Sunday that he doesn’t want Trump impeached, even if 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 investigation finds the president acted incorrectly.

He added that the oversight Congress and the Supreme Court have over the president is enough to check the president’s actions.