The blue slips give Democrats some power to block Trump’s nominations, angering the president despite the procedure having some GOP support.

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."

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.