It’s a phrase the New Jersey senator had repeated in many campaign speeches: beating Trump is the floor, not the ceiling. Booker dropped out of the crowded — and now whiter — Democratic primary on Monday, citing money constraints. Despite securing a significant number of endorsements in early nominating states, Booker was stuck in the low single digits in public polling.

His focus is now on his Senate reelection and the impending Senate impeachment trial of Trump, for which he will part of the Senate jury. But Booker’s message of love is still foremost on his mind.

"The lines that divide us are not as strong as the ties that bind us," he said Sunday.

The Iowa caucuses are to be held Feb. 3, followed by the New Hampshire primary on Feb. 11.

Booker said the greatest threat to the nation is the lack of movement on issues most people agree on, like commonsense gun safety and infrastructure. This inability to come together, he said, is undermining America’s competitiveness with countries like China.

“So I'm going to think hard about who to endorse,” Booker said. “And whoever the next president of the United States is, they've got to be able to heal this nation.”