President Donald Trump renewed his demand for the Senate's "blue slip" tradition to be done away with and urged Senate Judiciary Chair Chuck Grassley to tell Democrats to "go to HELL."

Senators are fiercely protective of the longstanding precedent that gives them deference over who serves as U.S. attorneys and district court judges back home.

It’s unclear whether the president could succeed in a legal challenge to the longstanding bipartisan tradition, which is an informal agreement between lawmakers not enshrined in law.