In this combination of file photos, former Vice President Joe Biden speaks in Wilmington, Del., on March 12, 2020, left, and President Donald Trump speaks at the White House in Washington on April 5, 2020. The Trump campaign is calling for a fourth debate to be added into the presidential-debate schedule, this one in early September, as the earliest scheduled debate now in the works for Sept. 29 comes weeks after the earliest early-voting periods begin in some states. (AP Photo, File) ** FILE **
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