Sen. Ted Cruz, R-Texas, told "Hannity" Monday that he agreed to present oral arguments before the Supreme Court in a key election-related case -- should the high court take the matter up -- because the matter "raises very serious issues."

The case brought by Rep. Mike Kelly, R-Pa., and Pennsylvania GOP congressional candidate Sean Parnell, alleges that a 2019 state law allowing no-excuse mail-in voting is unconstitutional. If the court agrees, according to KDKA, Kelly and Parnell said most of the commonwealth's mail-in votes in this past presidential election could be thrown out.

Kelly and Parnell were initially granted a stay by Pennsylvania Commonwealth Court Judge Patricia McCullough, but Democratic Gov. Tom Wolf's administration summarily filed an appeal with the State Supreme Court; a 5-2 Democratic majority. The higher court sided with Wolf, and Kelly's team moved to get the U.S. Supreme Court to rule.

The plaintiffs argue that the state does not have grounds to allow non-absentee vote-by-mail without a constitutional amendment. Nearly 30 Republican members of the state legislature have signed a document in amicus with Kelly and Parnell's case.