President Trump will nominate acting Defense Secretary Patrick Shanahan as secretary of defense, White House press secretary Sarah Sanders tweeted Thursday.

“Acting Secretary Shanahan has proven over the last several months that he is beyond qualified to lead the Department of Defense, and he will continue to do an excellent job,” Sanders tweeted.

Shanahan, 56, spent virtually his entire adult life working at Boeing Co., where he helped shepherd the 787 Dreamliner aircraft.

He joined the Trump administration as deputy defense secretary in 2017. When Defense Secretary Jim Mattis abruptly resigned last year over Syria policy, Shanahan was immediately thrust into the top job.

“I spent the better part of 18 months, if you will, sitting in the right seat of the cockpit with Secretary Mattis in the left seat,” Shanahan said in January at his first — and so far only — meeting with the press in the Pentagon briefing room, appropriately using an aircraft metaphor when asked how he was doing in his new job.

“So most of the material, the subject matter and the interactions are with people and subjects that are very, very familiar,” he said.

Shanahan brings less government experience to the position than any defense secretary since the department’s creation in 1947, with the exception of Neil McElroy, who served on the White House Conference on Education during the Eisenhower administration after a career at Procter & Gamble.

A congressional aide told NPR that Shanahan, during an office visit earlier this year, seemed overwhelmed by his new job of acting secretary.

The White House reached out to others for the top defense post, including Sen. Lindsey Graham, the South Carolina Republican, and retired Army Gen. Jack Keane. Both turned it down.

But recently, says a source close to the White House, Trump “got used to [Shanahan].”

Some Pentagon officials have said Shanahan is neither a forceful presence nor well-versed in foreign or defense policy. Shanahan himself suggested as much during his Senate confirmation hearing as deputy defense secretary in 2017.

“I believe my skill set strongly complements that of Secretary Mattis,” Shanahan said. “He’s a master strategist with deep military and foreign policy experience. … I bring strong execution skills with a background in technology, development and business management.”

As acting secretary, Shanahan has been a contrast to Mattis, who challenged the White House on policy decisions ranging from the use of torture to allowing transgender service members to remain on duty to keeping U.S. troops in Syria.

Trump used to note approvingly that Mattis’ nickname was “Mad Dog.” But over time their relationship cooled. In a 2018 interview, Trump even said Mattis was “sort of a Democrat.”

Shanahan is very much in charge when it comes to program management, such as creation of the Space Force. More complex military issues, like North Korea, Syria and Afghanistan could fall to others, principally Secretary of State Mike Pompeo and national security adviser John Bolton.

During his time as deputy defense secretary, Shanahan had a hard time finding his footing and needed a lot of direction from Mattis, senior Pentagon aides say. They add that Shanahan was more involved in weapons systems and projects, almost like a project manager rather than a No. 2 Pentagon official who must step back and see the big picture.

At a recent hearing before the Senate Armed Services Committee to discuss the administration’s proposed Pentagon budget, Shanahan seemed most comfortable talking about the way ahead for military programs, focusing on how the Pentagon will counter the growing military power of China and Russia.

“China’s defense spending approaches that of the United States, when we take into account purchasing power and the portion of our budget going to military pay and benefits,” Shanahan told senators.

“That, coupled with China’s organized approach to steal foreign technology, has allowed China to modernize its missile, space and cyber capabilities, as well as project power far beyond its borders,” he said. “Russia, for its part, continues to compete asymmetrically with the United States, modernizing and developing its own missile, space and cyber capabilities.”

Shanahan went on to talk about the need for a space force, a pet project of the president’s.

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