The order allows up to $ 50 billion to be allocated to the emergency system to help American states.
This will help build hospitals and discover new treatments, with health insurance, not a priority.
There are 1,701 cases confirmed by Covid-19 in the USA and 40 deaths.
The decision was announced by President Donald Trump of the White House, who was asked to say why he did not take the coronavirus test after meeting with people who were recently diagnosed as positive.
In Canada, Prime Minister Justin Trudeau has been in quarantine for 14 days, starting on Friday, with his wife being found with Covid-19.
At the same time, Brazilian President Jair Bolsonaro was tested and the result was negative, but a close friend of his has recently become ill. The two have met in recent days with several US officials, including Donald Trump and Vice President Mike Pence.