Mike Pence triggered a storm of controversy on Tuesday by failing to wear a face mask on a visit to the Mayo Clinic’s facilities in Minnesota. Pence leads the US government’s coronavirus taskforce though he is typically overshadowed by Donald Trump, or medical experts, at the group’s regular press briefings. Video from a journalist pool camera at the Mayo Clinic showed Pence visiting the facility and 10 people in the area around Pence, including a patient, wearing masks. Pence was not wearing one. On its website the Mayo Clinic advises: “Mayo Clinic is requiring all patients, visitors and staff to wear a face covering or mask to slow the spread of Covid-19.” In response to widespread online condemnation of Pence’s decision not to wear a mask, the Mayo Clinic tweeted that it had informed Pence of its mask policy before his arrival. The tweet was later deleted. The Democratic senator Brian Schatz from Hawaii criticized Pence for not wearing a mask, saying the vice-president was “setting a dangerous example” by not covering his face. It is not the first time Pence has triggered controversy by not wearing a mask. Earlier this month a photo circulated of a mask-less Pence greeting Colorado’s governor, Jared Polis, who was wearing a mask in the picture. Pence’s staff later insisted he did not need to wear the protective covering because he is regularly tested for the coronavirus. “When the face-covering guidelines were developed, it was with the intention to not only protect yourself, but primarily to protect others from asymptomatic spread,” Pence’s spokesperson said in response to questions about him not covering his face. “Vice-President Pence is negative for Covid-19 and is therefore not asymptomatic.” However, coronavirus tests are not foolproof, and the vice-president could potentially contract the virus in between tests, so the mask guidance should still apply to him.