President Donald Trump is considering issuing new travel restrictions that would affect citizens of up to 43 countries, including nationals from Cuba and Venezuela

Damir Ortiz, a 10-year-old with leukemia and a rare genetic disease that has caused a tumor in his left eye, was medevaced Wednesday from Cuba to the Nicklaus Children’s Hospital in Miami, after overcoming bureaucratic obstacles and the reluctance of the Cuban government.

Over 40 countries may face severe or total travel limitations by the United States, according to a memo obtained by the New York Times.