Trump was introduced to the stage by Melania in an unannounced appearance.
The race for the White House remained essentially a dead heat on Sunday -- with nine days to go until Election Day.
Former President Donald Trump delivered a speech Sunday afternoon at New York's Madison Square Garden. After making several stops in Philadelphia on Sunday, Vice President Kamala Harris held a rally there Sunday afternoon.
Almost 42 million Americans have cast a vote through early voting methods, as of Sunday afternoon, according to data from the University of Florida's Election Lab.
The about 41.9 million recorded mail and early in-person votes were evenly split with about 21 million mail ballots returned nationally and about the same cast at in-person early voting polling sites across the country, the data showed.
Early voting options are now open to voters in 50 states and the District of Columbia. Many early voting periods will last until the weekend before Election Day.
Beyoncé showed her support for Vice President Kamala Harris at the campaign's rally focused on abortion rights in Houston on Friday.
She was joined by fellow Destiny's Child alum Kelly Rowland on stage in introducing Harris to the crowd.
"I'm not here as a celebrity. I'm not here as a politician. I'm here as a mother," Beyoncé said.
Click here to read more about the rally.
After a three-hour podcast interview with Joe Rogan, Trump is expected to start his rally in Traverse City, Michigan, at 10 p.m. ET -- three hours after he was scheduled to take the stage.
As several hundred supporters dispersed from the airport hangar, Trump appeared on the Jumbotron notifying the crowd of his tardiness.
"Traverse City, I'm not going to be there for a little while. Filming Joe Rogan," Trump said.
He continued, "It's a Friday night, so we can sit around and do an extra special job when we get there. ... It's all about winning, and we had to spend some extra time with some people, and lots of people, actually, but we are going to do a special performance, and we'll be there, and I think you'll see the plane land, and the whole thing."
Trump concluded his message by thanking his supporters for sticking around.
Many attendees did call it quits on the former president and headed home early.
-ABC News' Kelsey Walsh, Lalee Ibssa and Soo Rin Kim
Minnesota Gov. Tim Walz ended his swing through eastern Pennsylvania on Friday with an energetic rally in President Joe Biden's hometown of Scranton.
The governor topped off his remarks by saying that Biden has "secured his place in history" by upholding a presidential tradition of putting the country above himself.
Speaking of the city of Scranton, Walz said, "This is a place with a long tradition of people who know something about hard work and people know what it means to serve this nation. ... I want you to know that the country owes a huge debt to you and a huge debt to Joe Biden," Walz said.
Chants of "Thank You, Joe" erupted from the crowd.
With Vice President Kamala Harris in Texas on Friday night for a rally centered on abortion rights, Walz also talked directly about reproductive policies in the state.
"Would this surprise you that in the most recent data, maternal mortality rates in Texas have shot through the roof?" he said. "So let's just be very clear. Women are dying because of these decisions they made, and it's absolutely immoral."
-ABC News' Isabella Murray
Country legend Willie Nelson took the stage at Harris' rally in Houston.
He played "Mammas Don't Let Your Babies Grow Up to Be Cowboys" and "On the Road Again."
Beyoncé is also expected to appear at the rally tonight in her hometown.
