President Trump escalated his fight with the legal industry by issuing an executive order aimed at Paul Weiss, one of the country’s top law firms.

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.

Experts have warned that the president’s efforts threaten the ability of lawyers to do their jobs and private citizens to obtain legal counsel.