Supreme Court takes on a GOP challenge to mail-in voting

• Rep. Michael Bost (R-Ill.) challenged a state electoral regulation following his reelection. He was joined by two other presidential electors.
• The current Illinois election law allows mail-in ballots to be counted for up to two weeks after the date of the election, so long as the ballots are postmarked by that date.

Zoom out: Lower courts previously ruled that Bost had no legal standing to bring the lawsuit. He's one of three Republicans in the Illinois delegation.

• The Supreme Court will consider the case during its next term, which begins in October.
• The challenge is backed by a conservative legal group.

Context: 16 states and Washington D.C. have laws that allow ballots to be received and counted after Election Day, given that they're postmarked on or before Election Day.

• Republicans have targeted ballots that arrive after Election Day, according to Democracy Docket, including via an executive order signed by President Trump in March.

Yes, but: A Trump-appointed federal district judge said Bost's case failed to state a legally viable injury claim, per the Hill.

• A panel on the 7th U.S. Circuit Court of Appeals agreed.

What he's saying: "With the American people's confidence in our elections at a discouraging low point, it's more important than ever we work to restore their trust," Bost said in a Monday statement.

• "I believe a big part of that effort is ensuring all votes are tallied by Election Day, not days or weeks later. I am thankful the U.S. Supreme Court has agreed to hear my appeal of Illinois' election law."

Go deeper: Three takeaways from the Supreme Court's big NEPA ruling

Editor's note: This story has been updated with Bost's statement.