WASHINGTON, April 28 (CGTN) - U.S. cases of COVID-19 surpassed more than 1 million on Tuesday.

Total deaths were 58,365, according to a running tally by Johns Hopkins University.

U.S. coronavirus deaths now surpass the number of American soldiers killed in the 20 years of the Vietnam War, 58,220.

The next country with the highest number of coronavirus cases is Spain with 232,000 cases.

U.S. Vice President Mike Pence faced criticism on Tuesday for not wearing a face mask while touring the Mayo Clinic in Minnesota.

Video shows Pence meeting a Mayo employee who had recovered from COVID-19 and was donating plasma. Everyone in the room was wearing a mask except for Pence.

He also was not wearing a mask while visiting a lab where coronavirus tests are performed despite a requirement by the medical facility that all visitors wear one.

The Mayo Clinic tweeted that it had informed the vice president of its mask policy prior to his arrival. The tweet was later removed.

Pence said he has been frequently tested for the virus and that he was following CDC guidelines that indicate a mask is good for preventing the spread of the virus by those who have it.

"And since I don't have the coronavirus, I thought it'd be a good opportunity for me to be here, to be able to speak to these researchers, these incredible healthcare personnel, and look them in the eye and say 'thank you'," Pence said.