Former President Donald Trump is using President Joe Biden and Vice President Kamala Harris’s feud during the 2020 primary to his advantage.

Harris ran an unsuccessful campaign for president in 2020, losing to Biden after vigorously attacking him during the Democratic debates. Though that was largely forgotten after the two united for the 2020 general election ticket, forming a united front throughout the Biden presidency, Trump brought the feud back into focus in an interview on Fox News’s Fox and Friends on Thursday morning.