U.S. President Donald Trump signed an executive order on Friday suspending security clearances for lawyers and other employees at New York law firm Paul, Weiss, Rifkind, Wharton & Garrison, and restricting their access to federal buildings and officials.

The president’s use of government power to punish firms is seen by some legal experts as undercutting a basic tenet: the right to a strong legal defense.

A D.C. federal judge said she will temporarily halt a Trump executive order targeting the law firm Perkins Coie, which represented Hillary Clinton.