WASHINGTON — Both major presidential candidates made appearances Thursday meant to fire up their core supporters, with Vice President Kamala Harris participating in a livestream with Oprah Winfrey and Donald Trump attending an event with prominent Jewish donors before addressing a gathering of the Israeli-American Council.

Winfrey, who has endorsed Harris and spoke at the Democratic convention in August, hosted a two-hour “Unite for America” nighttime streaming session in Michigan with Harris that organizers said would highlight dozens of grassroots groups backing the vice president.

Trump was in Washington to address a “Fighting Anti-Semitism in America” evening event with Miriam Adelson, a co-owner of the NBA’s Dallas Mavericks and widow of billionaire casino magnate Sheldon Adelson, who founded the Las Vegas Sands casino and was one of the Republican Party’s largest donors.

Trump was also scheduled to speak to the Israeli-American Council, a nonprofit long backed by Sheldon Adelson and Haim Saban, a major donor to President Joe Biden and Democratic causes. The council is holding its national convention in the weeks before the first anniversary of Hamas’ Oct. 7 attacks on Israel, which sparked the war in Gaza.

Earlier Thursday, leaders of a Democratic protest-vote movement against the Israel-Hamas war said they would not endorse Harris’ presidential bid but strongly urged their supporters to vote against Trump in November.

The “Uncommitted” movement drew hundreds of thousands of votes in Democratic primaries this year in protest of Biden’s handling of the Israel-Hamas war. The group’s leaders urged the administration to change its policy on the conflict, warning that some Democratic voters might otherwise abstain from voting in November, particularly in swing state Michigan.

Despite months of discussions with top Democratic officials, discontent within the protest-vote ranks only grew after the convention when they were denied a speaker on stage and other demands weren’t met.

Group leaders also made clear in their statement that they strongly oppose supporters voting for Trump or for a third-party candidate who “could help inadvertently deliver a Trump presidency.” Instead, they urged voters to register “anti-Trump votes and vote up and down the ballot.”

Meanwhile, Sen. JD Vance of Ohio, the Republican vice presidential nominee, said Wednesday that he would continue to describe Haitian residents in Springfield, Ohio, as “illegal aliens” even though most of them are in the country legally.

The immigrants are mainly in the United States under a program called temporary protected status, which the executive branch can grant to people whose home countries are in crisis. Vance claimed falsely that this program was illegal.

“If Kamala Harris waves the wand illegally and says these people are now here legally, I’m still going to call them an illegal alien,” he said in response to a reporter’s question after a rally in Raleigh, North Carolina. “An illegal action from Kamala Harris does not make an alien legal.”

Congress created the temporary protected status program in 1990, and presidents from both major parties have used it in response to wars, natural disasters and other humanitarian crises in various countries. The program allows people from countries designated by the Department of Homeland Security to live and work legally in the United States for 18 months, a period that can be renewed indefinitely. It does not include a path to permanent residency or citizenship.

The Obama administration granted the temporary protected status to Haitians living in the United States illegally after a 7.0 magnitude earthquake devastated Haiti in January 2010. Under Biden, the Department of Homeland Security has granted or renewed temporary protected status to immigrants from a number of countries, including Haiti, Ukraine and Venezuela. Harris did not make those decisions.

Trump’s administration sought to end protections for people from El Salvador, Haiti, Honduras, Nepal, Nicaragua and Sudan, although some of those decisions were challenged in court and Biden reversed some.

Vance’s comments Wednesday were of a piece with his and Trump’s attacks over the past two weeks. They have repeatedly spread false claims that Haitians in Springfield are stealing and eating pets, smears that local officials — including Republicans — and journalists have debunked.