President Donald Trump tweeted on Monday night that he will sign an executive order to temporarily suspend immigration to the U.S. due to the coronavirus pandemic.

“In light of the attack from the Invisible Enemy, as well as the need to protect the jobs of our GREAT American Citizens, I will be signing an Executive Order to temporarily suspend immigration into the United States!” he said.

Last month, Trump enacted a 30-day travel ban between the U.S. and several countries to help stop the spread of COVID-19. The list of countries included most of Europe, China, Canada, Mexico, Iran and South Korea. An executive order stopping all immigration would be an extraordinary measure taken by the president.

The number of confirmed coronavirus cases has hit nearly 800,000 in the United States, and the reported deaths have totaled more than 42,000. The U.S. has become one of the worst hit by the worldwide coronavirus pandemic.

Last week, Trump released guidelines for when certain businesses around the country can begin to reopen. Most restaurants, bars, movie theaters, museums and other non-essential stores have shut down during the pandemic as shelter-in-place rules have been set. The new guidelines said that once the number of coronavirus cases starts to have a downward trajectory and hospitals can treat patients without crisis care, states can begin to reopen certain areas. Employees can start to go back to work in phases, however, strict social distancing rules will still be in place until the COVID-19 threat drastically decreases.