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.
Robert F. Kennedy Jr. filed an emergency application with the U.S. Supreme Court Friday seeking an order that forces Michigan Secretary of State Jocelyn Benson to remove his name from the ballot.
The Michigan Supreme Court said RFK Jr. could not remove himself.
A response from the state is due Monday at 4 p.m.
-ABC News' Devin Dwyer
South Carolina Circuit Court Judge Daniel Coble ruled against the ACLU Friday in its request for a temporary restraining order to give some 1,900 teenagers the chance to register to vote after the state's registration deadline.
The ACLU of South Carolina sued the DMV and State Election Commission after the DMV failed to offer 17-year-olds obtaining a driver's license and who would turn 18 before Election Day the chance to register to vote at the DMV, a provision entitled by the Voting Rights Act.
Judge Coble wrote "relief sought by Plaintiff is too drastic" and, this near to Election Day, "would create disorder in the voting system," according to the ruling.
Coble denied the ACLU's motion but did not dismiss the case. A spokesman for the ACLU of South Carolina told ABC it has not made a decision on whether to appeal his ruling.
"We are still seeking permanent relief from the SCDMV’s unlawful exclusion of 17-year-olds from the National Voting Rights Act 'Motor Voter' provision," ACLU-SC spokesperson Paul Bowers said in a statement to ABC.
-ABC News' Christopher Boccia
A panel of three Trump-appointed judges on U.S. Court of Appeals for the 5th Circuit struck down Friday a lower court’s ruling that allows the state of Mississippi to continue counting mail-in absentee ballots if they’re received within five days of Election Day.
However, the court rejected Republicans’ initial request for a permanent injunction, sending the issue back to the district court for further consideration, making it unclear whether their order would apply ahead of Election Day.
The case– which could have wide-ranging impacts on the acceptance of late-arriving ballots throughout the country– is likely to be appealed to the U.S. Supreme Court.
U.S. Circuit Court Judge Andrew Oldham wrote on behalf of the conservative panel that the acceptance of ballots ends on the "election day," because "Congress statutorily designated a singular 'day for the election.'"
-ABC News' Isabella Murray and Olivia Rubin
As of 4:30 p.m. ET on Friday, more than 35 million Americans have voted early, according to the Election Lab at the University of Florida.
Of the votes cast, 16,080,81 were in-person early votes and 18,959,123 were mail-in ballots.
This means that more than 20 million people have voted since Monday.
