Vice President Kamala Harris and former President Donald Trump have thrown into question whether they will meet for a debate next month as scheduled, with the presidential nominees in disagreement over whether microphones should be muted. The Democratic and Republican presidential nominees are slated to meet Sept. 10 in Philadelphia for a debate on ABC News. The Harris campaign says it's told ABC they want microphones to be live, not muted when it's the other candidate's turn to speak, which is different from the rules for the June debate between Trump and President Joe Biden. Trump's campaign says the GOP nominee accepted the same rules for the ABC debate, but then Harris' campaign sought changes.

President Joe Biden and former President Donald Trump have agreed to hold two campaign debates, on June 27 hosted by CNN and on Sept. 10 hosted by ABC. CNN says its debate will be held in its Atlanta studios and "no audience will be present." The Democratic president earlier Wednesday announced he won't participate in fall presidential debates sponsored by the nonpartisan commission that's organized them for more than three decades. Biden proposed two debates with the Republican ex-president, excluding third-party candidates. Trump says, "Let's get ready to Rumble!!!" CNN holds open the door to Robert F. Kennedy Jr.'s participation if he or any other third-party candidate meets polling and ballot access requirements.