Washington: Independent US Senator Bernie Sanders and two of his Democratic colleagues have suggested that President Donald Trump should consider resigning, after a run of sexual harassment scandals that has driven out some members of Congress.

Senator Al Franken "felt it proper for him to resign," Sanders said in an interview with NBC's Meet the Press on Sunday morning, referring to the Democrat from Minnesota.

"Here you have a President who has been accused by many women of assault, who says on a tape that he assaulted women. He might want to think about doing the same."

The accusations against Franken include an episode of forcible kissing on a United Services Organisation entertainment tour for US troops before he was elected and several allegations that he groped women as he posed with them for photographs.