President Donald Trump on Friday vowed to seek accountability for those who pursued him during his years out of power, speaking at the U.S. Justice Department whose prosecutors had brought some of those cases.

The president, once the target of federal prosecution, is likely to announce steps to combat “weaponization” of the department, even as he uses its powers to punish enemies and reward allies.

President Donald Trump is set to deliver what the White House calls a law-and-order speech on Friday at the Justice Department, the storied building from which the government pursued criminal investigations and prosecutions against him.