House Republicans delivered articles of impeachment against Homeland Security Secretary Alejandro Mayorkas to the Senate, citing his refusal to combat record levels of illegal immigration.

A group of GOP impeachment managers walked over to the Senate Tuesday afternoon to officially deliver the articles and initiate an impeachment trial as Democrats seek to expedite the process or dismiss the charges altogether. Senators will be sworn-in as jurors on Wednesday to begin trial proceedings.

House Republicans narrowly voted to impeach Mayorkas in February on their second attempt after initially failing to so do. Mayorkas became the first cabinet secretary in nearly 150 years to be impeached after overseeing the Biden administration’s policy of allowing record numbers of illegal immigrants to cross the Southern border.

The first article of impeachment against Mayorkas accuses him of knowingly releasing illegal immigrants into the U.S. instead of detaining them, and the second article alleges he lied during congressional testimony and obstructed congressional oversight.

The vast majority of Americans are dissatisfied with how Biden is handling immigration and a trial against Mayorkas could bring further scrutiny to vulnerable Democratic senators seeking to distance themselves from the party’s immigration stance.

“It would be beneath the Senate’s dignity to shrug off our clear responsibility and fail to give the charges we’ll hear today the thorough consideration they deserve,” Senate Minority Leader Mitch McConnell (R., Ky.) said Tuesday morning. “I’ll strenuously oppose any effort to table the articles of impeachment and avoid looking at the Biden administration’s border crisis squarely in the face”