Facebook, Snap, Google, and roughly 160 other technology companies told a federal court in Virginia on Wednesday to scrap President Donald Trump's new order banning travelers and refugees from several majority-Muslim countries. This is the latest step Silicon Valley leaders have taken to combat the president's proposed immigration policies.

The group of businesses--which also includes Twitter, Uber, and SpaceX--said the new order would inflict "substantial harm on U.S. companies, their employees, and the entire country," in a brief filed in the U.S. District Court of Appeals for the Fourth Circuit.

The order "hinders the ability of American companies to attract talented employees, increases costs imposed on business, makes it more difficult for American firms to compete in the international marketplace, and gives global enterprises a new, significant incentive to build operations--and hire new employees--outside the United States," according to the brief.

Announced in early March, the new order would bar people from Iran, Libya, Somalia, Sudan, Syria, and Yemen from entering the U.S for 90 days, and all refugees for 120 days. A federal court in Hawaii struck down the revised executive order hours before it was supposed to go into effect and a federal judge in Maryland also temporarily blocked the order.

Tech companies have been fighting Trump's immigration policies since January, when the president issued an initial version of his travel ban. A federal judge later blocked that order.

Silicon Valley is also railing against new restrictions on the H-1B visa program, which allows highly skilled tech professionals from other countries to work in the U.S. Trump signed an executive order on Tuesday that will revamp how those visas are awarded, and the White House says it will look closely at companies that employ foreign workers.