Masking has historically been associated with 'frontier justice' and groups like the Ku Klux Klan. Although the Trump administration argued that masks were needed for ICE agents' safety, it did not mandate them. State legislation, like Washington's, is based on solid legal arguments.
Erin Chemerinsky, Dean of the University of California Law School, argued that masks are not essential for ICE to perform its functions and that officer safety is a pretext for intimidation. U.S. District Judge Christina A. Snyder, in February, issued a preliminary injunction blocking California's anti-masking law, but rejected the Trump administration's claim that these state laws were an unconstitutional usurpation of federal authority.