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The Secret Service has refused to disclose how many of its employees have tested positive or have had to quarantine, citing privacy and security.

The social media campaign took off over the weekend after the Proud Boys -- designated a hate group by the Southern Poverty Law Center.

Other positive cases close to Trump now include his wife Melania, his close aide Hope Hicks, his campaign manager Bill Stepien, two of McEnany's assistants.

However, White House physician Sean Conley has said the president is "not yet out of the woods".

Press Secretary Kayleigh McEnany said Trump was receiving the anti-viral drug remdesivir following consultation with specialists.

The Democratic presidential candidate emphasised on the importance of wearing masks, saying they are the most important, powerful public health tool.