The United States government could expand coronavirus requirements for travellers beyond the United Kingdom as early as next week, sources briefed on the matter told the Reuters news agency on Wednesday, as the Canadian government announced that all passengers must have tested negative for COVID-19 within three days before their arrival in the country. The US Centers for Disease Control and Prevention (CDC) and other US agencies held a lengthy call with US airlines Wednesday that discussed expanding the requirements, sources briefed on the call said. The US government on Monday began requiring all airline passengers arriving from the UK – including US citizens – to test negative for COVID-19 within 72 hours of departure. A US Department of Transportation spokesman confirmed the call with airlines took place, Reuters reported.