President Trump recently added Nigeria and five other countries to his list of nations facing stringent travel restrictions.

It is a move that will virtually block immigration from Africa’s most populous nation, Nigeria, and from Myanmar, where the Muslim minority is fleeing genocide.

Under the ban no Nigerian will now be issued visa to live or work in the United States. The Nigerian government has so far been quiet in this national disgrace that groups Nigeria with countries like Sudan and Eritrea.

Beside Nigeria, three other African countries, Eritrea, Sudan and Tanzania, will face varying degrees of restrictions, as will one former Soviet state, Kyrgyzstan.

All six countries have substantial Muslim populations. The total number of countries now on the restricted travel list stands at 13.

Immigrant visas, issued to those seeking to live in the United States, will be banned for Nigeria, Myanmar, Eritrea and Kyrgyzstan. The ban will also prevent immigrants from Sudan and Tanzania from moving to the United States through the diversity visa lottery, which grants green cards to as many as 50,000 people a year.

The proclamation will take effect on February 22. Immigrants who obtain visas before then will still be able to travel to the United States.

Nonimmigrant visas, including those for students and certain temporary workers, as well as visas reserved for potential employees with specialized skills, will not be affected by the ban.