Stephen Miller blasts Barrett, Roberts for caving to the 'radical left' in SCOTUS mail-in voting ruling

White House Deputy Chief of Staff for Policy Stephen Miller called out Supreme Court Justices Amy Coney Barrett and John Roberts Monday, accusing the two of "cav[ing] to the radical left" by ruling in favor of a Mississippi law allowing mail-in ballots to be counted even if they are received after Election Day. 

"Justice Roberts and Justice Barrett decided to cave to the radical left. [Justice] Alito was so clear in his wording about what Election Day means. Nobody could read the statute, could read that opinion, could read what Alito wrote and come to any other conclusion," he told "The Ingraham Angle."

"It's Election Day, not election week, not election month, not election months. So this was really a travesty, and it underscores why we have to keep fighting to pass the SAVE America Act."

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Miller's remarks came after Roberts and Barrett sided with liberal justices in a 5-4 ruling Monday, holding that Election Day, in the context of federal law, set a deadline for when voters must make a choice regarding their preferred candidate but said that relevant laws have no standard for when ballots must be received to be considered valid. 

Trump-appointed Barrett authored the majority opinion ruling in favor of the law. She was joined by Chief Justice John Roberts, as well as Justices Sonia Sotomayor, Elena Kagan and Ketanji Brown Jackson.

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Justice Samuel Alito penned the dissent, warning the decision could erode already-fragile trust among many in the nation's electoral systems.

Miller argued Monday that the American people elected Republican majorities in Congress hoping to see the SAVE Act passed, echoing other conservatives who have cited the Supreme Court's recent ruling as evidence that more ballot box protections are needed.

"80 million Americans elected a Republican Senate majority, and they elected a Republican Congress to deliver on this fundamental priority," he said.

"It must get done."

Fox News' Robert Schmad and Anders Hagstrom contributed to this report.