Congressman Keith Ellison of Minnesota says he will not attend Donald Trump's presidential inauguration on Friday.
Ellison joins more than 30 other House Democrats planning to skip the inauguration, ABC News reports.
His announcement came on the federal holiday that honors civil rights leader Martin Luther King Jr. It seemed to be tied to Trump's clash with one of the activists who marched with King in the 1960s.
John Lewis, who is now a Congressman from Georgia, told NBC's Meet the Press over the weekend he doesn't see Trump as "a legitimate president" because of Russian interference in the election.
Ellison is among those who rallied to Lewis' defense over the holiday weekend.
Sen. Al Franken, another Minnesota Democrat, was among those expressing support for Lewis.
But Franken will not join those who are boycotting Trump's inauguration, an aide to the senator told WCCO.
Hamline University political science professor David Schultz told the station the last large-scale boycott of an inauguration by members of Congress came when Abraham Lincoln was elected in 1860 and many representatives from southern states refused to attend.
Trump meets with King's son
Apart from the inauguration boycott and online bickering, there were also signs of conciliation Monday – including some that involved the children of Martin Luther King.
King's youngest daughter, Bernice King, spoke at the Atlanta church where her father was once the pastor. She told the congregation "Don't be afraid of who sits in the White House," Reuters reports, and drew a standing ovation when she added "God can triumph over Trump."
Later in the day King's oldest son went to Trump Tower to meet with the president-elect.
Trump appeared in the lobby to be photographed with Martin Luther King III, reports the New York Times, but did not answer reporters' questions about their meeting. King called it constructive, saying Trump emphasized he will represent all Americans.
Fewer than 10 percent of the black voters in November's election supported Trump, the Associated Press says.