Iran Press/ America: Brent crude slipped on the news and was down $1.47 cents, or 3.6%, at $39.4 a barrel by 0615 GMT. U.S. oil was also $1.40, or 3.6% cents, lower at $37.32.
U.S. oil is heading for a drop of nearly 6% this week, while Brent is on track to fall more than 7%, in a second consecutive week of decline for both contracts.
In a tweet, Trump said he and First Lady Melania Trump tested positive for COVID-19. Trump said earlier he had started a quarantine process after Hope Hicks, a top adviser, had returned a positive test.
Oil was already in negative territory after a bipartisan deal for more economic relief in response to the pandemic continued to elude House Speaker Nancy Pelosi and the White House, adding to fears about worsening demand without more support for the economy.
“Oil remains the weakest link to the COVID headlines as it reinforces the view that anyone, even the commander and chief, is susceptible to the virus,” said Stephen Innes, chief global markets strategist at AXI, referring to the U.S. president.
The news makes it more likely that Democratic contender Joe Biden will win the presidential election just over a month away, he said.
Crude supplies from the Organization of the Petroleum Exporting Countries (OPEC) in September rose by 160,000 barrels per day (bpd) from a month earlier, a Reuters survey showed.
The increase was mainly the result of more supplies from Libya and Iran, OPEC members that are exempt from an agreement to withhold production between OPEC and allies led by Russia – a group known as OPEC+.
New COVID-19 cases worldwide have risen to more than 34 million, nearly 2 million more than at the end of last week, based on Reuter's tallies.
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