Two more members of US President Donald Trump's campaign staff who helped organize his weekend election rally in Tulsa, Oklahoma, have tested positive for coronavirus, the campaign said Monday.

US President Donald Trump speaks during a campaign rally at the BOK Center on June 20, 2020 in Tulsa, Oklahoma. (File photo by AFP)

The two staffers, members of the advance team, attended the rally but "were wearing masks during the entire event," said campaign communications director Tim Murtaugh.

"Upon the positive tests, the campaign immediately activated established quarantine and contact tracing protocols," Murtaugh said.

Several hours before Saturday's rally, the campaign said that six members of the advance team in Tulsa had tested positive for COVID-19.

Trump, who is facing a tough reelection battle in November, went ahead with the rally, his first since the pandemic began, despite concerns among health authorities that it could further spread the highly-contagious virus.