2024 election live updates: Crowd gathers for Trump's Madison Square Garden rally

Superstar Beyoncé is set to appear in her hometown with Harris during the vice president's planned rally in Houston, Texas, on Friday, according to two sources with Harris' presidential campaign and the White House.

The musician was thought to be on the program for the Democratic National Convention in Chicago, but she did not end up performing despite headlines saying she was planning to. The buzz around the potential performance was notable.

Friday's event is slated to be focused on reproductive health care. Beyoncé has spoken publicly about her own fertility journey.

The moment comes as Democrats are hopeful that their Texas Senate candidate Colin Allred is surging, though he remains behind in the polls.

-ABC News' MaryAlice Parks, Gabrielle Abdul-Hakim and Molly Nagle

With just 12 days left in the campaign, Harris on Thursday will do local media interviews in Georgia before a 8 p.m. ET rally with former President Barack Obama and concert with Bruce Springsteen.

Trump will be in Arizona for a rally at 5 p.m. ET before going to Nevada for a Las Vegas rally hosted by Turning Point Action at 10 p.m. ET.

Former President Donald Trump addressed a packed 13,000-seat arena in Duluth just outside of Atlanta on Wednesday, suggesting to supporters -- without evidence -- that vote counting might not be secure.

"Got to get out there and vote, but most importantly, just vote whichever way you want to do it," Trump said at the rally hosted by Turning Point USA.

"I've been one that says whichever way. Just get out and vote. Be a little careful. Make sure your vote gets counted. There are ways of doing that too."

Trump also again floated a conspiracy theory that Vice President Kamala Harris did not hold a public campaign event on Wednesday because she already knew the results of the coming election.

"Maybe she knows something we don't know," Trump said. "That's bad, right? Maybe she knows something we don't know."

"Does everybody understand that? Maybe," he added, to supportive responses in the crowd.

-ABC News' Lalee Ibssa, Soo Rin Kim and Kelsey Walsh

In a Wednesday social media post, former President Donald Trump suggested that Vice President Kamala Harris criticized him as a "fascist" because she is losing ground in the presidential race.

"She is a Threat to Democracy, and not fit to be President of the United States -- And her Polling so indicates!" Trump fired back at the vice president.

"Now she is increasingly raising her rhetoric, going so far as to call me Adolf Hitler," Trump added.

Trump did not mention why Hitler's name emerged. The New York Times reported this week that the former president allegedly praised Hitler, according to former White House chief of staff John Kelly.

-ABC News' Kelsey Walsh, Lalee Ibssa and Soo Rin Kim