WASHINGTON — Just days after Defense Secretary Jim Mattis announced he would step down from that post in late February, President Donald Trump announced he would push the popular Cabinet member out even earlier.

In a tweet Sunday morning, Trump announced that Deputy Secretary of Defense Patrick Shanahan will become acting secretary of defense starting Jan. 1. He praised the Pentagon’s second-in-command as having “a long list of accomplishments” and added, “He will be great!”

The move cuts short Mattis’ tenure by two months, and adds to an acrimonious end of the relationship between the commander in chief and his top military leader.

On Thursday, Mattis in a resignation letter told Trump he was making the move to allow the president to find “a secretary of defense whose views are better aligned with yours.”

He said his February departure date was designed to minimize disruption on the department during the leadership transition.

But Mattis’ criticism of Trump’s national security policies in the letter — in opposition to his announced withdrawal of U.S. forces from Syria and his past negative comments towards U.S. foreign allies — clearly irked Trump, leading to the early dismissal.

On Saturday, Trump appeared to fire back at Mattis on social media, tweeting that “when President Obama ingloriously fired Jim Mattis, I gave him a second chance. Some thought I shouldn’t, I thought I should.”

In a statement after Sunday’s announcement, Defense Department spokesman Army Col. Rob Manning said only that “the secretary of defense serves at the pleasure of the president. The department remains focused on national security.”

Mattis remains popular among lawmakers on Capitol Hill and the armed forces. A Military Times poll conducted in late September found that nearly 84 percent of troops had a favorable view of his work leading the armed forces. Among officers, the figure was almost 90 percent.

But Mattis’ relationship with Trump had appeared to sour in recent months as the president pushed for more aggressive military policies.

Pentagon officials appeared caught unaware by sudden decisions made in the Oval Office on forming a new Space Force, sending troops to the southern U.S. border, and banning transgender recruits from the ranks.

Most recently, Trump’s decisions to begin massive troop withdrawals in the Middle East and Afghanistan seemed to go against military commanders’ advice.

Shanahan, who is among the candidates to permanently replace Mattis, is now in a position to drive changes he's championed as Mattis' deputy.

The former Boeing executive in his current role has pushed for systemic changes to the acquisition system that pushes the Pentagon's focus away from annual budget cycles and more on making programs successful.

“Too often we focus on process, or budget, or level of effort,” Shanahan told Defense News in an earlier interview. “The Pentagon should focus on outcomes and outputs — our performance. This focus on performance should drive us to field unmatched lethality, execute on our modernization plans and achieve this affordably.”

He has also focused on eliminating duplicative programs — for example, situations where the Army and Air Force both have a need for a similar system and develop unique solutions on their own, rather than joining up and creating a single system that can be used department-wide.

In the past, services have pushed back on that idea because of the unique needs of, say, a Navy system designed to go to sea and survive the elements and sea-salt air, or an Army system designed to work on land.

Shanahan has risen to the top of the list of likely successors to permanently replace the now-fired Mattis, partly because of his business background and good relationships with both Trump and Vice President Mike Pence.

But Shanahan has clashed with some in the Pentagon who say he’s is too focused on having meetings, sucking up staff time without having many concrete victories to point to, according to officials who have worked with him who spoke to Defense News.

Reporter Aaron Mehta contributed to this story.

Leo covers Congress, Veterans Affairs and the White House for Military Times. He has covered Washington, D.C. since 2004, focusing on military personnel and veterans policies. His work has earned numerous honors, including a 2009 Polk award, a 2010 National Headliner Award, the IAVA Leadership in Journalism award and the VFW News Media award.

David B. Larter was the naval warfare reporter for Defense News.

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