WASHINGTON – President Donald Trump this afternoon will discuss gun legislation with a bipartisan group of lawmakers, seeking momentum amid concerns of a slowdown on the issue just two weeks after Parkland.

Among the participants: Florida Sen. Marco Rubio and Reps. Ted Deutch, Brian Mast, Stephanie Murphy and John Rutherford.

But the state's senior senator, Democrat Bill Nelson, got passed over. Nelson's office said this morning he hadn't gotten an invite, which other lawmakers received Tuesday.

It's not clear why Nelson — who shared the CNN town hall stage with Rubio and Deutch — was snubbed.

.@SenBillNelson clearly frustrated that the WH did not invite him to the bipartisan meeting on guns today. "I don't know why I wasn't invited... And of course that doesn't foster bipartisanship when you're trying to solve a problem," he told ABC. — Ali Rogin (@AliABCNews) February 28, 2018

But it's not the first time.

When Trump visited Fort Myers after Hurricane Irma, Nelson was not part of the tour, attended by a large group of Florida politicians. An invite did come but it was late, Nelson said, and he was on his way to North Florida to survey damage there.

With 2.5 million people still out of power, Trump stood in an aircraft hangar and urged Gov. Rick Scott to run against Nelson.

"The job he's done is incredible," the president said, later adding: "I hope this man right here, Rick Scott, runs for the Senate."

At the CNN town hall, which Scott skipped, Nelson took several shots at the governor, leading to some criticism he was overly political.