() The Trump administration is reportedly considering a travel ban on as many as 43 countries.

The New York Times reports that officials who spoke on the condition of anonymity said the list of countries to be banned was developed by the State Department, and changes are likely by the time it reaches the White House.

Travel editor Peter Greenberg said while some countries on the list don’t come as a surprise, such as Yemen or Syria, others are, such as countries in the Caribbean.

“Even the announcement that they’re being proposed on the list is sending a chill through the travel industry,” Greenberg said. “A lot of people re-thinking their travel plans and that’s a bad thing for everybody.”

There’s been a drop in the last five and a half weeks of foreign visitors to the United States, Greenberg said.

This includes from Canada.

Statistics Canada said Canadian residents flew back from 585,700 trips to the United States in February a 13.1% decline from last year. The country recently changed its rules for traveling to the United States amid concerns surrounding some of Trump’s policies. 

Starting April 11, Canadians who will be in the United States for more than 30 days will have to register with U.S. authorities. If they don’t, it could result in “penalties, fines and misdemeanors,” according to a travel advisory.

Ironically, though, airfares have been going down in the midst of this, Greenberg added.