South Carolina Senator Lindsey Graham incited the fury of President Donald Trump’s most fervent supporters after describing the president’s decision to pardon more than 1500 Jan. 6 insurrectionists as a “mistake”—with one former prisoner slamming Graham as a “Republican in name only.

Trump pardoned about 1,500 people who were charged for their actions during the Jan. 6 Capitol riot. That number includes 172 who pleaded guilty to assaulting law enforcement officers. Graham, however, points out that Trump said he would grant the pardons if he was reelected.

The South Carolina Republican told CNN that he “did not like” how Trump pardoned people who “beat up cops,” and suggested he would be open to curtailing the presidential pardon power.