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The US vice president's spokeswoman became the second White House staffer this week to test positive for coronavirus. Miller is spokeswoman for Vice President Mike Pence, giving her frequent access to high-level meetings.
She is also married to top Trump aide Stephen Miller, the speech writer behind the administration's hardline immigration measures.
On Thursday, a Trump spokesman said the president's valet, a member of the military who is in close contact with the president, had tested positive.
Trump and Pence were tested and confirmed to be negative. Both are tested daily. White House press secretary Kayleigh McEnany said there was no risk of a White House outbreak or threat to Trump.
