Election 2024 updates: Michelle Obama to speak at DNC this week

Minnesota Gov. Tim Walz on Tuesday will embark on his first solo Harris-Walz campaign event as Harris' running mate with a stop in Los Angeles for the American Federation of State, County and Municipal Employees (AFSCME) international convention.

Walz is set to speak at 3:35 p.m. ET.

Walz emerged as a popular candidate among labor unions during Harris' search for a vice president pick, sources said. AFSCME represents 1.4 million public service members, and the union's president, Lee Saunders, previously released a statement endorsing Harris for president.

Harris will outline her economic policy in a speech in Raleigh, North Carolina, on Friday, her campaign announced, making it her first major policy rollout since jumping into the race.

Harris' speech will detail her plan to "lower costs for middle-class families and take on corporate price-gouging," a campaign official said.

The vice president has heavily focused her stump speech on the economy while on the campaign trail in recent weeks, saying over the weekend she would look to eliminate taxes on tips earned by service workers -- a proposal Trump announced earlier this summer.

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

The historically Black Alpha Kappa Alpha Sorority Inc., of which Vice President Kamala Harris counts herself a member, started its own political PAC last week, according to a filing with the Federal Election Commission posted Monday.

The committee is named Alpha Kappa Alpha Sorority PAC, Inc., or AKA 1908 PAC, the filing shows.

Harris has been an AKA since her days as a student at the historically Black Howard University in Washington, D.C. Harris on Monday visited the campus, her office confirmed to ABC News, but it’s not clear why she was there.

In July, before President Joe Biden dropped out of the race, Harris spoke at the AKA’s annual Boulé in Dallas, Texas. Since then, as a candidate, she’s also addressed similar national gatherings of two other historically Black sororities, Zeta Phi Beta and Sigma Gamma Rho.

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

After discussing the assassination attempt made against him in Pennsylvania in July, former President Donald Trump said he's planning a trip back to Butler in October.

"We're going back to Butler; we're gonna go back in October," Trump said, adding, "Butler is a big, great area."

Addressing what he'll say when he returns, Trump told Musk, "I think I'll probably start by saying I was so horribly interrupted."