President Donald Trump’s new ban on travel to the U.S. by citizens from 12 mainly African and Middle Eastern countries is set to take effect Monday amid escalating tension over the president’s unprecedented campaign of immigration enforcement.

The Trump administration announced in a proclamation on Wednesday that it will ban nationals from Haiti from entering the United States and partially limit Cubans and Venezuelans from coming into the country.

U.S. Rep. Mike Lawler, a fellow Republican, urged the Trump administration to reverse its decision. Lawler's 17th District includes Spring Valley, home to the second-largest Haitian diaspora, per capita, in the U.S.