On Thursday, President Donald Trump targeted another elite law firm that has represented clients he considers his political enemies, sending a forceful message that he is willing to punish firms who work for people or groups that oppose his administration’s agenda.

In an Oval Office ceremony, the president signed an executive order hitting the large international law firm Perkins Coie with a sweeping directive that bans the federal government from hiring it, or from using contractors who work with it, except in limited circumstances. The order also bars Perkins Coie employees from entering federal buildings and suspends their security clearances.