The US President said he and the First Lady would begin their "quarantine and recovery process immediately" following the diagnosis.
"Terrible! The First Lady and I are waiting for our test results".
However, as a precautionary measure, the POTUS and FLOTUS are starting their quarantine process.
It was not immediately clear how long Trump will remain in quarantine.
Aside from confirmed as being at the debate in Ohio, Hope Hicks was also on Air Force One when Donald Trump was on his way to Minnesota for a campaign rally.
Multiple White House staffers have previously tested positive for the virus, including Vice President Mike Pence's press secretary, Katie Miller, national security adviser Robert O'Brien and one of the president's personal valets. Treasurys are rallying after the president's positive COVID-19 test. "Then I just went out with a test".
The quarantining of the president and first lady also raised the likelihood that numerous president's other senior advisers, who also were within close proximity to Ms. "I mean, who knows", he said.
Trump Adviser Hope Hicks Tests Positive for Coronavirus
She served previously as White House communications director and as a spokesperson for Trump's 2016 presidential campaign. President Trump and first lady Melania Trump depart the White House Tuesday for the first televised presidential debate.
Stay tuned to Pinkvilla for more updates.
Hicks returned to the White House earlier this year after a stint in the private sector.
The White House tests aides and anyone else who comes into contact with the president daily. She was isolated from other passengers aboard the plane, the person said.
Trump and his staff do not wear masks regularly and the president has denigrated people who wear them.
The extraordinary setback for Trump had immediate political consequences just 31 days before election day, forcing him to cancel campaign trips and adding new volatility to a contest already steeped in tension.
As the shock news sent global stocks sliding, leaders including Germany's Angela Merkel and Britain's Boris Johnson wished the president and first lady a speedy recovery - while Russian President Vladimir Putin predicted Trump's "vitality, good spirits and optimism" would see him through.
For months, President Trump has downplayed the severity of the virus and contradicted medical professionals on the importance of wearing masks. Earlier this summer, Herman Cain, a previous candidate for the Republican presidential nomination, died after attending an indoor Trump rally in Tulsa, Oklahoma, this summer.
Sean Conley, the president's physician, released a memorandum about the first family.