Protesters demonstrate outside an FBI office in Milwaukee on Saturday after agents arrested a county judge accused of helping a man evade immigration authorities.

The arrest marks a significant escalation in the Trump administration's crackdown on immigration, as well as in its battles with judges across the country.

U.S. officials arrested a Wisconsin judge on Friday and charged her with helping a man in her court evade immigration authorities in an escalating dispute between President Donald Trump's administration and local officials over immigration enforcement.