In this April 2, 2019, file photo, Secretary of the Army Mark Esper speaks during a House Armed Services Committee budget hearing on Capitol Hill in Washington. President Donald Trump on June 18, named Esper as acting Defense Secretary. (AP Photo/Andrew Harnik)

WASHINGTON (AP) — President Donald Trump’s pick for new defense secretary is an Army veteran who served in the first Iraq war and also has experience as a national security adviser on Capitol Hill as well as a defense industry lobbyist.

Trump announced Friday that he would nominate Mark Esper to lead the Pentagon. Trump had already named Esper, his current Army secretary, to lead the Defense Department on an acting basis, starting Sunday.

“I know Mark, and have no doubt he will do a fantastic job!” the president tweeted Tuesday.

He later told reporters: “He’s very experienced. He’s been around all of the things that we’ve been talking about for a very long period of time.”

Esper was sworn in as Army secretary in November 2017 following a seven-year stint as vice president for government relations at defense contractor Raytheon. That lobbyist background raised immediate alarms from Citizens for Responsibility and Ethics in Washington, which said that Raytheon had recently won multiple government contracts worth hundreds of millions of dollars.

“While Esper may not have had sway over these types of deals as Secretary of the Army, as acting Secretary of Defense he will have potential influence over such deals,” as well as a proposed merger between Raytheon and United Technologies Corp., CREW executive director Noah Bookbinder said in a statement.

Esper previously served a national security adviser for former Senate Majority Leader Bill Frist.

He was policy director for the House Armed Services Committee and a professional staff member on the Senate Foreign Relations committee and also advised former Obama administration Defense Secretary Chuck Hagel when Hagel was in the Senate.

He’s also served as a deputy assistant secretary of defense and was a war planner on the Army staff.

Esper spent more than a decade in the Army, including serving in the Persian Gulf War in 1990 and 1991 with the 101st Airborne Division. He has won the Bronze Star Medal and other awards.

“He has a great background. I know him and I think he’ll do very well in the acting role,” said Sen. David Perdue, R-Ga., a close Trump ally who speaks frequently with the president.

It is not clear whether Esper’s defense industry background might complicate any confirmation prospects.

Shanahan, for instance, came under scrutiny because of his prior career as a Boeing executive and persistent questions about possible conflicts of interest.

The Defense Department’s Inspector General cleared Shanahan of any wrongdoing in connection with accusations he had shown favoritism toward Boeing during his time as deputy defense secretary, while disparaging Boeing competitors.

But even so, Bookbinder said Shanahan’s past work at Boeing overshadowed his decisions at the Defense Department.

“His successor will likewise risk being tainted by his previous work for a major defense contractor,” Bookbinder said.

Associated Press writer Lolita C. Baldor contributed to this report.