Even before the immigration case landed on Judge James Boasberg's desk, he had ruled on cases involving President Donald Trump.

Boasberg is also well-known among Trump allies for his role as a judge on the secretive Foreign Intelligence Surveillance Court during the period when the FBI was investigating whether Trump's successful 2016 campaign had colluded with Russia to tip the outcome of the election.

At least two-thirds of the Senate would have to vote to remove a judge from office, which is unlikely to happen.