A crowd of more than 200 protesters gathered to oppose Milwaukee County Circuit Judge Hannah Dugan's arrest and felony charges.

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.

The FBI on Friday arrested a Milwaukee judge accused of helping a man evade immigration authorities, escalating a clash between the Trump administration and local authorities over the Republican president's sweeping immigration crackdown.