House Majority Whip Jim Clyburn (D-SC) speaks during a news conference with House Speaker Nancy Pelosi (D-CA) and other members of House Democratic Leadership on Capitol Hill on January 3, 2019 in Washington, DC. WASHINGTON - The highest-ranking Black member of Congress says President Donald Trump should concede the presidency to President-elect Joe Biden, although he says it’s more crucial what the rest of the Republican Party does in the wake of the 2020 election.RELATED: After President Donald Trump’s 2020 loss, can he run again in 2024?U.S.