The rally is scheduled for Oct. 5.
Trump has long promised to return to Butler to honor the victims from his July rally.
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"I WILL BE GOING BACK TO BUTLER, PENNSYLVANIA, FOR A BIG AND BEAUTIFUL RALLY, HONORING THE SOUL OF OUR BELOVED FIREFIGHTING HERO, COREY, AND THOSE BRAVE PATRIOTS INJURED TWO WEEKS AGO. WHAT A DAY IT WILL BE - FIGHT, FIGHT, FIGHT! STAY TUNED FOR DETAILS," Trump wrote on his social media platform in July.
ABC News' Katherine Faulders, Lalee Ibssa, Kesley Walsh and Soorin Kim
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