Vice President Kamala Harris’s vice presidential contenders are using attacks on Sen. J.D. Vance (R-OH), former President Donald Trump‘s running mate, to distinguish themselves from their competition.

Harris’s running mate spot is a coveted one: As many as seven high-profile politicians have been rumored to be on her short list. With Vance already set as their would-be direct competition, a few potential running mates have taken shots at him.