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.

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.

Protesters are chanting and marching outside the FBI on Saturday after agents arrested a Milwaukee judge accused of helping a man evade immigration authorities.