Michigan threatens to sue companies that let Donald Trump inside without a mask

'We're going to take action against any company or any facility that allows him inside those facilities and puts our workers at risk'

Michigan has threatened legal action against any company that allows Donald Trump into their facilities without wearing a face mask.

The state's attorney general Dana Nessel said during an interview with CNN that if Trump doesn't wear a mask, he'll be asked "not to return to any enclosed facilities inside our state."

"I think we're going to take action against any company or any facility that allows him inside those facilities and puts our workers at risk. We simply can't afford it here in our state," she said.

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Mr Trump travelled to Michigan on Thursday to visit the Ford factory in Ypsilanti that has been repurposed to make ventilators for coronavirus patients.

On his way, he told reporters he didn't know whether he would or wouldn't wear a mask.

"Well I don't know, we're going to look at it. A lot of people have asked me that question," Trump said.

Health experts have warned that factory workers who meet with the president during his visit to small towns across the country could risk spreading coronavirus.

"The White House is a potential hot zone for Covid - aides and valets close to the president are diagnosing positive," Dr Vin Gupta, a pulmonologist and global health policy expert told NBC News.

"If I'm a factory owner, do I really want a large group of visitors from the West Wing visiting me now under these circumstances, just to snap a few pictures? No."