Sean P. Jackson is the head of the Black Republican Caucus of Florida, and he's also serving as a Donald Trump surrogate in the state. He claims that the head of the Trump campaign in Florida, Karen Giorno, has repeatedly blown off his efforts at getting the campaign to take African-American voters seriously. In fact she apparently couldn't even remember what he looked like, despite his prominence within the campaign and the numerous conversations they'd had.
When the Secret Service asked Jackson what he was doing backstage at a Donald Trump rally, he identified himself, but none of Trump's people backstage could vouch for him because none of them recognized him. He claims he asked Giorno to vouch for him, but she said she didn't recognize him either, so he was escorted out under the assumption he didn't belong.