The former Florida governor challenged the current Republican frontrunner at a campaign event in Florida Monday.

“Donald, I’ll take you on one-on-one in a debate, any time, any place,” Bush told the crowd at the Forum Club in Palm Beach. “You name it and I’ll do it.”

Bush, polling at 4% last week, is trailing far behind Trump, who leads the field at 28% in the same Quinnipiac University poll. Bush is likely looking take back some of his momentum before the Feb. 1 Iowa Caucus.

The two have repeatedly traded jabs, setting up for a main event fight that could be entertaining—as neither campaign has held any punches. Trump called Bush “low energy,” while Bush went as far as calling the billionaire a “jerk” earlier in December.

“Just one other thing — I gotta get this off my chest — Donald Trump is a jerk,” said Bush on Dec. 19 at a New Hampshire rally. “You cannot insult your way to the presidency. You can’t disparage women, Hispanics, disabled people. Who is he kidding?”

The next Republican presidential debate is on Jan. 14 in Charleston, South Carolina.

This article was originally published on Time.com.