Hours before President Donald Trump's return to the campaign trail, six staff members tested positive for Covid-19, the disease caused by the novel coronavirus, the president's campaign announced Saturday.

The six staffers were members of the advance team working to help set up Trump's Tulsa, Okla., rally Saturday night - the president's first large-scale campaign event since the country locked down three months ago in an attempt to contain the pandemic.

Trump Campaign Communications Director Tim Murtaugh said in a statement that the six positive tests were among "hundreds of tests performed, and quarantine procedures were immediately implemented. No Covid-positive staffers or anyone in immediate contact will be at today's rally or near attendees and elected officials."