The Sept. 29 debate between President Trump and former Vice President Joe Biden was widely criticized for its off-the-rails nature and lack of structure. The Commission on Presidential Debates announced changes to the debate rules ahead of Thursday's final presidential debate.
Under the new rules, President Trump and Democratic presidential nominee Joe Biden will each have two minutes of uninterrupted time to speak at the beginning of every 15-minute segment of the debate. "The only candidate whose microphone will be open during these two-minute periods is the candidate who has the floor under the rules," the commission announced. After that, there will be time for discussion with both candidates' microphones open. It's an effort to allow Trump and former Vice President Biden more equitable time to answer questions in the final presidential debate.
In a statement, the Trump campaign said it was "committed to debating" Biden "regardless of last minute rule changes from the biased commission in their latest attempt to provide advantage to their favored candidate." source