U.S. President Joe Biden and former U.S. President Donald Trump on Wednesday agreed to hold two campaign debates

Hours later, Biden said he accepted an invitation from CNN to a debate on June 27, adding, “Over to you, Donald. As you said: anywhere, anytime, any place.” Trump said on Truth Social he’d be there, adding, “Let’s get ready to Rumble!!!”

And soon after they agreed to the second debate on ABC. Trump said on Truth Social it was his “great honor” to accept the debates.

Biden said he, too, had received and accepted the invitations. “Trump says he’ll arrange his own transportation. I’ll bring my plane, too. I plan on keeping it for another four years,” he wrote on X.

Still, the two sides appeared to be hold some differences on key questions of how to organize the debates, including agreeing on moderators and rules — some of the very questions that prompted the formation of the Commission on Presidential Debates in 1987.

Biden’s campaign had proposed excluding third-party candidates, such as Robert F. Kennedy Jr., from the debates outright. Under the debate commission’s rules, Kennedy or other third-party candidates could qualify if they secured ballot access sufficient to claim 270 Electoral Votes and polled at 15% or higher in a selection of national polls.

CNN said that the debate would be held in its Atlanta studios and that “no audience will be present.” It said moderators and other details would be announced later. The network held open the door to Kennedy’s participation if he or any other candidate met polling and ballot access requirements similar to the commission’s.

As recently as Wednesday morning, Trump expressed his desire for a large live audience.

“I would strongly recommend more than two debates and, for excitement purposes, a very large venue, although Biden is supposedly afraid of crowds – That’s only because he doesn’t get them,” Trump said. “Just tell me when, I’ll be there.”

Trump has been pushing for more debates and earlier debates, arguing voters should be able to see the two men face off well before early voting begins in September. He has repeatedly said he will debate Biden “anytime, anywhere, any place,” even proposing the two men face off outside the Manhattan courthouse where he is currently on criminal trial in a hush money case. He also has been taunting Biden with an empty lectern at some of his rallies.

Biden’s campaign has long held a grudge against the nonpartisan commission for failing to evenly apply its rules during the 2020 Biden-Trump matchups — most notably when it didn’t enforce its COVID-19 testing rules on Trump and his entourage — and Biden’s team has held talks with television networks and some Republicans about ways to circumvent the commission’s grip on presidential debates.

Biden campaign chair Jen O’Malley Dillon on Wednesday sent a letter to the Commission on Presidential Debates to say that Biden’s campaign objected to the fall dates selected by the commission, which come after some Americans begin to vote, repeating a complaint also voiced by the Trump campaign. She also voiced frustrations over the rule violations and the commission’s insistence on holding the debates before a live audience.

“The debates should be conducted for the benefit of the American voters, watching on television and at home — not as entertainment for an in-person audience with raucous or disruptive partisans and donors,” she said. ”As was the case with the original televised debates in 1960, a television studio with just the candidates and moderators is a better, more cost-efficient way to proceed: focused solely on the interests of voters.”

There was little love lost for the commission as well from Trump, who objected to technical issues at his first debate with Democrat Hillary Clinton in 2016 and was upset after a debate with Biden was canceled in 2020 after the Republican came down with COVID-19. The Republican National Committee had already promised not to work with commission on the 2024 contests.

The commission did not immediately respond to a request for comment on Wednesday.

The Trump campaign issued a statement on May 1 that objected to the scheduled debates by the commission, saying that the schedule “begins AFTER early voting” and that “this is unacceptable” because voters deserve to hear from the candidates before ballots are cast.

O’Malley Dillon said the debates “should be one-on-one, allowing voters to compare the only two candidates with any statistical chance of prevailing in the Electoral College – and not squandering debate time on candidates with no prospect of becoming President.”

The Democrat suggested that the two candidates could pick some dates, taking a dig at Trump’s ongoing New York hush money trial by noting that the Republican is “free on Wednesdays,” the usual day off in the trial.

The president first indicated he would be willing to debate Trump during an interview with the radio host Howard Stern last month, telling him that “I am, somewhere. I don’t know when. But I’m happy to debate him.”

Biden indicated again last week that he was preparing to debate, telling reporters as he was leaving a White House event: “Set it up.”