Inside Trump's Relationship With Japanese Prime Minister Abe

The two leaders have met more than most.

In a brief news conference following the roughly 90-minute meeting, Abe called Trump "a leader who I can have great confidence in," and said that their talk was "very candid, very cordial," according to a translation of his remarks.

"No one knows exactly what’s ahead," said Kennedy, who served as the American ambassador to Japan during President Obama’s second term, "but I think that the alliance is still important to the U.S. and I think we should all be confident that it will remain strong."

Now the two men are set to spend the most time together yet, as they are going to meet in Washington today, but extend the visit into the weekend. Following meetings in D.C. that will likely focus on defense and economic cooperation, Abe and his wife, Akie Abe, will fly to Trump's "Winter White House," the Mar-a-Lago resort in Florida, for weekend golfing. Abe gifted Trump a high-end golf driver when the pair met at Trump Tower in New York last November.

The Mar-a-Lago visit will also make Abe the first known foreign leader to visit three of Trump's residences, after his visits to Trump Tower and the White House.

ABC News’ Elizabeth McLaughlin contributed to this report.