Approximately 2,200 people attended his rally inside the Linda Rondstadt Music Hall.
More queued outside apparently.
Tucson police estimate some 5k were lined up to see Trump at the Linda Ronstadt Music Hall downtown. First responders say they’ve responded to at least 40 different heat injury calls so far.
Also as PP mentioned:
Ahead of Donald Trump’s second visit to Tucson on Thursday, local media reported his campaign was asked to make an upfront deposit of $145,222. The step was taken after his campaign failed to clear an outstanding fee of $81,837 from a 2016 event held at Tucson Convention Centre (TCC). The bill comprised the cost of 180 police officers who were deployed for six and a half hours to provide security at the event.