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 new national security adviser is reportedly planning major staffing changes at the National Security Council.

Sources close to the situation told Foreign Policy that John Bolton is preparing to “clean house” and remove nearly all of the political appointees brought in by his predecessor.

“Bolton can and will clean house,” one former White House official told Foreign Policy.

Another former official said any National Security Council officials appointed under former President Obama “should start packing their shit.”

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Foreign Policy reported that Bolton is planning to remove dozens of current officials, with a focus on those who have been “disloyal” to the president.

Bolton is the newest high-level addition to the Trump administration. The president announced late Thursday via tweet that Bolton would be replacing H.R. McMaster, making him Trump’s third national security adviser in just 14 months.

I am pleased to announce that, effective 4/9/18, @AmbJohnBolton will be my new National Security Advisor. I am very thankful for the service of General H.R. McMaster who has done an outstanding job & will always remain my friend. There will be an official contact handover on 4/9. — Donald J. Trump (@realDonaldTrump) March 22, 2018

The shake-up came just days after Trump also fired his 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, replacing him with CIA Director Mike Pompeo Michael (Mike) Richard PompeoOvernight Defense: House Democrats unveil stopgap spending measure to GOP opposition | Bill includes .6B for new subs | Trump issues Iran sanctions after world shrugs at US action at UN Navalny calls on Russia to return clothes he was wearing when he fell ill US issues Iran sanctions to enforce UN action ignored by international community MORE.

By hiring Bolton, many have speculated that Trump is moving to the right on foreign policy issues. Bolton has been a harsh critic of the Iran nuclear deal, and supported the Iraq War as former President George W. Bush’s ambassador to the United Nations. He also penned an op-ed making the case for a strike on North Korea.