The United States and Canada will ban all non-essential travel between the two countries. President Donald Trump made the announcement on Twitter Wednesday morning, writing: “We will be, by mutual consent, temporarily closing our Northern Border with Canada to non-essential traffic. Trade will not be affected. Details to follow!” CNN reported earlier that the exact definition of non-essential travel is still being finalized. It’s still to be decided exactly what types of vehicles and people would still be allowed to travel and for what reason. The announcement follows separate reports that the Trump administration is planning to shut the U.S. border with Mexico and Canada this week to asylum-seekers and other foreigners who don’t have permission to enter the country. According to The Wall Street Journal, the administration is planning to use a provision of public-health law that allows immigration officials to deny entry to foreigners who pose a risk of spreading infectious diseases.