Secret Service agents swarmed Hillary ClintonHillary Diane Rodham ClintonDavis: The shocking fact that Mueller never would have accused Trump of a crime Trump says he would challenge impeachment in Supreme Court The Hill's Morning Report - Will Joe Biden's unifying strategy work? MORE at her Las Vegas rally Thursday after animal rights activists jumped onstage in protest. 

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The incident happened as Clinton was talking up Catherine Cortez Masto, a Democratic candidate to replace retiring Sen. Harry ReidHarry Mason ReidSenate buzzsaw awaits 2020 progressive proposals Sanders courts GOP voters with 'Medicare for All' plan Glamorization of the filibuster must end MORE (D-Nev.).

A Secret Service agent could be heard telling the presidential nominee: "You're OK. Keep talking. ... We're not going anywhere." 

"Apparently, these people are here to protest Trump because Trump and his kids have killed a lot of animals," Clinton said to applause, referring to GOP rival Donald TrumpDonald John TrumpDemocrats' CNN town halls exposed an extreme agenda Buttigieg says he doubts Sanders can win general election Post-Mueller, Trump has a good story to tell for 2020 MORE, after a short pause.