Former President Donald Trump is sending Sen. J.D. Vance (R-OH) as an attack dog against Vice President Kamala Harris and her running mate on the campaign trail.

Vance, aiming to take the charge against Harris’s running mate, is set to make appearances in parallel with the Democratic candidates for three days across four battleground states, Politico reported. This will start with an event in Philadelphia on Tuesday, which corresponds with the first joint rally by Harris and her soon-to-be-announced running mate.