Independent Rep. Justin Amash Justin AmashRon Paul hospitalized in Texas Internal Democratic poll shows tight race in contest to replace Amash Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill MORE (Mich.) reacted to Tuesday's news that national security adviser John Bolton John BoltonJudge appears skeptical of Bolton's defense of publishing book without White House approval Maximum pressure is keeping US troops in Iraq and Syria Woodward book trails Bolton, Mary Trump in first-week sales MORE had been ousted from the Trump administration by saying he should never have been hired in the first place.

"I hope the president’s next national security adviser will focus on securing peace, not expanding war," tweeted Amash, who left the Republican Party earlier this year after backing President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's impeachment.

John Bolton never should have been hired. I hope the president’s next national security adviser will focus on securing peace, not expanding war. — Justin Amash (@justinamash) September 10, 2019

Trump announced on Twitter that Bolton would be leaving his post, citing disagreements with his suggestions but not providing specifics.

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Trump added that Bolton submitted his resignation on Tuesday and that he would tap a new national security adviser next week.

Amash, who has not ruled out challenging Trump for the White House in 2020, has firmly staked out his opposition to U.S. military activity not sanctioned by Congress, a stance at odds with several of Bolton's hawkish policies.

Appointed in March 2018, Bolton was Trump's third national security adviser.

The president broke with Bolton on a number of key issues, including the administration's approach to Iran and the relevance of North Korean missile tests.