Hillary Clinton has hired one of the nation's top Latino activists to work on organizing key groups of supporters ahead of November.

Cristobal J. Alex, head of the Latino Victory Project, will join the campaign as a deputy director of voter outreach and mobilization, the campaign and the group announced Monday.

The move comes as Clinton is on the verge of clinching the Democratic presidential nomination Tuesday, with a focus in recent days on the California primary, where her opponent, Sen. Bernie Sanders of Vermont, has made a big play for younger Latino voters.

It follows increasingly hostile remarks by Donald Trump, the presumptive Republican presidential candidate, about a Mexican American judge overseeing a legal challenge to his now-defunct university. He has also attacked the nation's only female Hispanic governor, as well as Latino journalists.

Clinton enjoys a wide lead over Trump among Hispanics, but many Latino political operatives and Democrats privately fret that her campaign may fail to capitalize on Trump's historically bad ratings among Hispanic voters and ensure big Latino turnout in key states this November.

Alex has led the nonpartisan Latino Victory Project for the past several years and will take a leave of absence for the duration of the campaign, the group said. He will be succeeded temporarily by Cesar Blanco, a Texas state legislator and former congressional chief of staff who serves as the group’s political director.

The organization, founded by top Clinton supporter Henry Munoz and the actress Eva Longoria, has spent the past several years trying to build Latino political engagement by running voter registration drives and recruiting, endorsing and funding Latino political candidates. Most recently, it's been part of a push to encourage legal immigrants to apply for citizenship, a campaign that helped boost citizenship applications by more than 30 percent year-to-year.

News of Alex's hire was first reported by Reuters.

The Clinton camp has added other key Latino Democratic operatives to its ranks in recent days. Carlos Sanchez, formerly the chief of staff to Rep. Joaquin Castro (D-Tex.) and a former top aide to House Minority Leader Nancy Pelosi (D-Calif.), officially joins the campaign this week as a deputy political director.