Donald Trump was in a bad mood before he emerged for a confrontational speech in Arizona last week.

TV and social media coverage showed that the site of his campaign rally, the Phoenix Convention Center, was less than full. Backstage, waiting in a room with a television monitor, Trump was displeased, one person familiar with the incident said: TV optics and crowd sizes are extremely important to the president.

As his surrogates warmed up the audience, the expanse of shiny concrete eventually filled in with cheering Trump fans. But it was too late for a longtime Trump aide, George Gigicos, the former White House director of advance who had organized the event as a contractor to the Republican National Committee. Trump later had his top security aide, Keith Schiller, inform Gigicos that he’d never manage a Trump rally again, according to three people familiar with the matter.

Gigicos, one of the four longest-serving political aides to the president, declined to comment.