Donald Trump’s attacks against a federal judge’s Mexican heritage have led two Republican officials in New Jersey to formally withdraw from the GOP.

John Labrosse, the Republican mayor of Hackensack, N.J., and his deputy mayor Kathleen Canestrino switched their party registration to “independent” this week, following the firestorm over Trump’s suggestion that U.S. District Court Judge Gonzalo Curiel is incapable of presiding over a case involving Trump University because he’s “a Mexican.”