WASHINGTON (AP) — The nonpartisan Commission on Presidential Debates has rejected a request from the Trump campaign to either add an additional general election debate or move up the calendar for the contests.

In a letter to Trump private attorney Rudy Giuliani, his liaison to the commission, the commission writes it is committed to its existing schedule of three debates between Trump and his Democratic challenger, Joe Biden, saying it would consider a fourth debate only if both sides agree to it. Both major party nominees have agreed to participate in the three scheduled debates, the commission said.

“If the candidates were to agree that they wished to add to that schedule, the Commission would consider that request but remains committed to the schedule of debates it has planned as reflected in the attached release,” the commission wrote in a letter obtained by The Associated Press.

Giuliani wrote to the debate commission Wednesday requesting that the schedule be moved up on account of expanded early and mail voting because of the coronavirus pandemic. Trump’s campaign has highlighted that 16 states will have started voted by the time of the first scheduled debate on Sept. 29.

Biden campaign spokesman TJ Ducklo said in a statement that Biden would appear at the scheduled debates.