(CNN) -- President Donald Trump continues his charm offensive with members of Congress Wednesday, breaking bread with one of his Republican primary rivals, Florida Sen. Marco Rubio.

The two men and their wives are scheduled to have dinner in the White House Blue Room at 6:30 p.m. ET.

Rubio told reporters at the Capitol that the President invited them for what Rubio expects to be "mostly a social" dinner.

"Obviously, we got to know each other a little bit over the last year and a half on the campaign trail. I don't know when it was scheduled -- a while back," he said. "We're grateful to them."

Rubio declined to share what he plans to discuss with the President.

"We're looking forward to it," he said. "I'm sure the food is really good."

Wednesday night's visit won't be Rubio's first trip to the White House since Trump became president. The senator accompanied his friend, former South Carolina Gov. Nikki Haley, to her swearing-in last month as US ambassador to the United Nations.

Campaign rivals

It's no secret that Trump and Rubio squared off in some of the most high-profile clashes of the Republican primary, roughly one year ago.

Rubio labeled Trump a "con artist" and mocked the size of Trump's hands in what became a surprising locker-room attack from the normally composed Rubio. The senator later apologized to Trump for the "hands" comments and publicly expressed regret.

For Trump's part, the billionaire used the moniker "Little Marco" when talking about the senator, even to his face at a debate in Houston, and at one point poked fun at the heel size of Rubio's boots.

The mending of fences appeared to be underway late last year, when Rubio was running for re-election to his Senate seat. While still stressing he disagreed with Trump on a number of issues, he endorsed the Republican nominee last summer.

And while Trump never appeared on the trail with Rubio, Vice President Mike Pence campaigned with the senator in Florida.

Still, even as late as a month before the election, Rubio said he wished Americans "had better choices for President."

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