The mayor of Tulsa has declared a civil emergency and curfew in advance of President Trump's upcoming campaign rally. The measures come amid warnings from law enforcement that violent individuals plan to converge on the city to cause unrest. There is also growing concern that the massive event could turn into a COVID-19 super-spreader. Oklahoma reported a record number of cases Thursday at 450, up from 259 Wednesday. The indoor arena hosting the rally holds 19,000 people.