A contentious scenario could play out if President Trump disagrees with assessments of his ability to perform in office, says John Fortier, former executive director of the Continuity of Government Commission. Trump is seen here preparing to leave the White House earlier this week for a fundraising event and campaign rally in Minnesota.

WASHINGTON, DC – SEPTEMBER 30: U.S. President Donald Trump exits the Oval Office and walks toward Marine One on the South Lawn of the White House on September 30, 2020 in Washington, DC. President Trump is traveling to Minnesota for a fundraising event and a campaign rally. (Photo by Drew Angerer/Getty Images)