WASHINGTON -- Six staffers working on US President Donald Trump's upcoming rally in Tulsa, Oklahoma, have tested positive for the coronavirus, or COVID-19, a campaign spokesman said on Saturday.

"Per safety protocols, campaign staff are tested for COVID-19 before events. Six members of the advance team tested positive out of hundreds of tests performed, and quarantine procedures were immediately implemented," Tim Murtaugh, communications director for Trump's 2020 campaign, said in a statement.

"No COVID-positive staffers or anyone in immediate contact will be at today's rally or near attendees and elected officials," Murtaugh added.

The announcement came only hours before the Tulsa rally, the first of its kind for Trump in more than three months.