Former U.S. Secretary of Defense Mark Esper joined nine other former defense secretaries in calling for an end to challenges to the presidential election.

US Secretary of Defense Mark Esper (R) and Chairman of the Joint Chiefs of Staff, Army US Army General Mark Milley, meet with Israeli Defense Minister Benny Gantz at the Pentagon on September 22, 2020 in Washington, DC. (Photo by Olivier DOULIERY / AFP) (Photo by OLIVIER DOULIERY/AFP via Getty Images)