Hundreds of supporters gathered outside Tulsa's Bank of Oklahoma Center arena since early Saturday morning ahead of President Trump's rally.
Among the supporters was a visible law enforcement presence, according to video footage taken by CNN's Jeremy Moorhead.
Attendees began entering the rally arena roughly five hours before Trump was set to speak, and the overwhelming majority of them appeared to not be wearing masks.
The Trump campaign has previously said that it takes "safety seriously," and noted hand sanitizer, temperature checks and masks will be provided to attendees, though actually wearing a mask won't be required.
Watch the videos below: