Former President Joe Biden’s preemptive pardons for members of a House committee on the Jan. 6 attack are “void” and “vacant” because Biden used an autopen to sign them, President Donald Trump said. Trump made the argument in a post on Truth Social early on Monday, according to Axios.

The use of the autopen, a device that reproduces signatures and is ubiquitous in government and business, is ordinarily uncontroversial. There is no power to undo a pardon in the Constitution or case law.