Vice President Joe Biden offered up a blistering attack against presumptive Republican nominee Donald Trump Thursday night, denouncing his “racist” and “reprehensible” comments against Judge Gonzalo Curiel.

Biden, who was speaking at the American Constitution Society convention in Washington, warned attendees that Trump could not be trusted as president and could abuse his power by committing impeachable offenses given his “direct threat” against the judge. He specifically singled out Trump’s past statement saying that he could level a civil suit against Curiel once he is elected president in November.