Mike Pence criticised for Mayo Clinic visit without mask

US vice president visits Minnesota medical research centre and is at times the only person on the tour not wearing a mask.

US Vice President Mike Pence has been criticised for not wearing a mask during a visit to a medical centre.

Pence visited the Mayo Clinic in Minnesota on Tuesday.

The research centre later said on Twitter that the vice president had been informed of a mandatory mask policy.

The tweet has since been deleted.

Al Jazeera’s Mike Hanna reports.