In a post on social media, Biden shared a clip from the Republican presidential debate Wednesday night which shows Florida Gov. Ron DeSantis criticising Trump for not showing up.
"Donald Trump is missing in action," DeSantis says in the clip.
"That's right," Biden wrote.
Biden's latest attack on Republican supporters contrasts his pledge when he first became president to "heel the nation".
During his victory speech three years ago, he explained that his first priority upon taking office will be addressing the coronavirus pandemic and healing political division.
At the time, he said: “I sought this office to restore the soul of America, to rebuild the backbone of this nation, the middle class, and to make America respected around the world again, and to unite us here at home."
Polling suggests Biden’s message is failing to break through.