President Donald Trump has revolutionized the pardon process during his second term in office, constitutional experts say, setting in place a system that seeks to clear people he believes have been unfairly targeted by the justice system.

There are two primary ways to grant pardons. The traditional system, stretching back to the 1890s, is a lengthy process that goes through the Justice Department’s Office of the Pardon Attorney. A second method, historically used only rarely, allows the president to bypass the yearslong process, swiftly clearing people who have been brought to his attention and possibly enabling those with access to the administration to reach his ear and pitch him for a pardon.