Hundreds of law firms and former judges have signed onto friend-of-the-court briefs in support of Perkins Coie as the law firm challenges President Trump’s executive order targeting it.

More than 500 law firms and 300 retired judges asked for leave to file two amicus briefs condemning Trump’s order stripping security clearances from and severing government ties with the major law firm, which previously did work for Democrats.

“Although we do not take this step lightly, our abiding commitment to preserving the integrity of the American legal system leaves us no choice but to join together to oppose the (executive order) that is at issue in this litigation,” wrote Donald Verrilli, a former solicitor general under former President Obama, in the law firms’ brief.

The brief asks U.S. District Judge Beryl........

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