A day after calling Harris "mentally impaired," Trump used similar language against Harris and President Joe Biden at a rally on Sunday in Pennsylvania.

"Crooked Joe became mentally impaired. Sad, but lying Kamala Harris, honestly, I believe she was born that way,” Trump told a crowd in Erie, Pa. “There's something wrong with Kamala, and I just don't know what it is, but there is definitely something missing."

At a rally in Wisconsin on Saturday, Trump declared, “Kamala is mentally impaired. “If a Republican did what she did, that Republican would be impeached and removed from office, and rightfully so for high crimes and misdemeanors.”

-- ABC News' Lalee Ibssa

The Department of Justice sued the State of Alabama and its top election official on Friday for allegedly removing voters from its election rolls too close to the November election.

Last month, Alabama Secretary of State Wes Allen announced that he had begun inactivating the voter registrations of 3,251 people who had been previously issued noncitizen identification numbers.

The National Voter Registration Act prohibits states from removing voters from rolls within 90 days of a federal election, and Alabama's voter roll maintenance commenced 84 days ahead of the November election, the Justice Department alleged.

Read more here.

-ABC News' Peter Charalambous

Minnesota Gov. Tim Walz sat in a suite at the ‘Big House' on Saturday watching the University of Minnesota, his state’s college football team, play the University of Michigan following a rainy morning spent with students, Michigan fans and athletic staff and the Gophers’ head coach, PJ Fleck.

The governor landed earlier this morning – dressed in a blue ‘Harris-Walz’ sweater, not his Gophers’ maroon and gold– in nearby Superior Charter Township, where he greeted student organizers at the airport.

These students had shuttled a yellow school bus onto the tarmac that said ‘Put me in Coach’ along with other decorations. He was also greeted by Rep. Debbie Dingell and Wayne County Executive Warren Evans.

Walz then made his way to Michigan’s stadium and met with Wolverine fans at a tailgate outside. He called the stadium a "shrine to football," and talked with several fans.

Going inside the stadium, Walz walked down a tunnel and onto the field before greeting a familiar face– Minnesota’s coach Fleck. First Lady Gwen Walz also came over to have a conversation as well.

The Walzes then spoke with five Minnesota cheerleaders and had some fun moments with Goldy Gopher, Minnesota’s mascot. He also met with some Michigan athletics staff.

Later in the evening, former President Donald Trump was scheduled to attend the Georgia Bulldogs-Alabama Crimson Tide game.

-ABC News' Isabella Murray

Vice President Kamala Harris was asked by reporters what she had discussed earlier with Border Patrol agents while touring the border wall in Arizona.

The vice president said the agents work long hours and need more support.

"I’m here to talk with them about what we can do to continue to support them and to also thank them for the hard work they do," she said.

-ABC News' Gabriella Abdul-Hakim, Fritz Farrow and Will McDuffie