![](http://www.ecns.cn/hd/2020/04/29/011023320c3743438faa6a513f1890f2.jpg)
Vice President Mike Pence visits a recovered COVID-19 disease patient who is now donating his blood for research on the virus and disease as he tours Mayo Clinic facilities supporting coronavirus disease (COVID-19) research and treatment in Rochester, Minnesota, U.S., April 28, 2020. (Photo/Agencies)
Mike Pence triggered a storm of controversy by failing to wear a face mask on a visit to the Mayo Clinic's facilities in Minnesota.
![](http://www.ecns.cn/hd/2020/04/29/7835510d44d649a5aed731273c854915.jpg)
Vice President Mike Pence visits with lab physicians and techs while touring Mayo Clinic facilities supporting coronavirus disease (COVID-19) research and treatment in Rochester, Minnesota, U.S., April 28, 2020. (Photo/Agencies)
![](http://www.ecns.cn/hd/2020/04/29/a347787306a044e79aee248884605a1a.jpg)
Vice President Mike Pence visits with lab physicians and techs while touring Mayo Clinic facilities supporting coronavirus disease (COVID-19) research and treatment in Rochester, Minnesota, U.S., April 28, 2020. (Photo/Agencies)