Defense Secretary Jim Mattis said President Trump has made a decision on the United States' strategy for Afghanistan.

Trump made the decision after a "sufficiently rigorous" review process, Mattis said on Sunday amid a trip to Jordan where he is set to meet with King Abdullah II on Monday. Mattis will also visit Turkey and Ukraine during his trip.

"I am very comfortable that the strategic process was sufficiently rigorous and did not go in with a pre-set position," Mattis told reporters traveling with him. "The president has made a decision. As he said, he wants to be the one to announce it to the American people."

Mattis offered no other details about the decision or when the White House would announce it.

In January, Trump announced a review of the U.S.'s policy on Afghanistan.

On Friday, Trump met with his national security team at Camp David to discuss Afghanistan, but no details emerged from that huddle. Gen. John Nicholson, who is the top U.S. commander on the ground in Afghanistan, was not invited to the Camp David talks.

Trump tweeted on Saturday about the Camp David meeting: "many decisions made, including on Afghanistan."

Since U.S. forces invade and overthrew a Taliban government more than 15 years ago, fighting has still ravaged Afghanistan.

According to Reuters, Trump's top national security aides are backing adding between 3,000 and 5,000 more U.S. troops in Afghanistan, and allowing them to get closer to combat while embedded with Afghan forces.