The ban, which does not include the UK or Ireland, will begin at 11.59pm on Friday, March 13th and last for 30 days. It will include all countries in Europe's Schengen area.
That means all foreign nationals, unless they are exempt from the ban (see below) won't be allowed to board planes for the US from Schengen countries while the ban is in place.
The restrictions do not apply to permanent residents in the US who need to get home to the US or their close family members, although it is possible that airlines may cancel flights in the days ahead as passenger numbers fall.
The countries in the Schengen area are: Austria, Belgium, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden and Switzerland.
Trump blamed EU countries for not acting quickly enough to stem the spread of the “foreign virus”. The president had previously banned travel from China when the virus was spreading rapidly through the country.
“The European Union failed to take the same precautions and restrict travel from China and other hotspots. As a result a large number of new clusters in the United States were seeded by travellers from Europe.”
At least 1,257 people in 44 states and Washington, DC have tested positive for coronavirus, according to the latest figures from the New York Times database. At least 37 patients with the virus have died.
In Europe the number of cases has passed the 22,000 mark with 930 deaths.
Trump said: “In total, as of March 9th, 2020, the Schengen Area has exported 201 COVID-19 cases to 53 countries. Moreover, the free flow of people between the Schengen Area countries makes the task of managing the spread of the virus difficult.”
What we know about who is affected by the ban and who isn't
It affects most foreign nationals who have been in Schengen area countries for 14 days before the ban comes into place at 11.59pm Friday March 13th.
It won't affect flights that depart before then but are due to land in the US after that time.
“I have determined that it is in the interests of the United States to take action to restrict and suspend the entry into the United States, as immigrants or nonimmigrants, of all aliens who were physically present within the Schengen Area during the 14-day period preceding their entry or attempted entry into the United States,” reads the full text of the restrictions.
The restriction doesn't apply to travel from the UK or Ireland, but it was unclear how US authorities plan to deal with foreign nationals travelling from Europe to the US via those countries.
Permanent residents of the US are not affected by the ban as are certain family members such as their children. Children of US nationals or permanent residents will also be allowed entry.
Legal spouses of US citizens or permanent residents are also not affected as are parents of US citizens or permanent residents as long as their children are unmarried and under the age of 21.
Siblings of US citizens or permanent residents are also exempt, “provided that both are unmarried and under the age of 21.”
Other exceptions are made for foreign nationals including crew members on planes or boats, UN or Nato employees and those travelling on the invitation of the US government.
It also exempts “any alien whose entry would not pose a significant risk of introducing, transmitting, or spreading the virus, as determined by the Secretary of Health and Human Services”.
The US Department of Homeland Security has said that further guidance on the travel suspension will come within the next two days.
The declaration warns that: “An alien who circumvents the application of this proclamation through fraud, willful misrepresentation of a material fact, or illegal entry shall be a priority for removal by the Department of Homeland Security.“
How has Europe reacted?
So far reaction to Trump's ban has been muted but that may change throughout the day.
President of the European Council Charles Michel tweeted “we will assess the situation today.”
The World Health Organisation has previously advised against closing borders and banning international travel.