The Trump administration has issued an ultimatum to 36 countries, most of them in Africa, demanding immediate improvements to their travel vetting procedures or risk facing a ban on their citizens entering the United States. The directive gives these nations a Wednesday deadline to express a commitment to enhancing security measures.

Those that fail to meet the administration’s expectations could be added to the U.S. travel ban list, which currently covers 12 countries.

Out of the 36 countries identified in the cable, 25 are located in Africa. The full list includes:

Angola, Antigua and Barbuda, Benin, Bhutan, Burkina Faso, Cambodia, Cameroon, Cape Verde, the Democratic Republic of Congo, Djibouti, Dominica, Ethiopia, Egypt, Gabon, Gambia, Ghana, Ivory Coast, Kyrgyzstan, Liberia, Malawi, Mauritania, Niger, Nigeria, St. Kitts and Nevis, St. Lucia, São Tomé and Príncipe, Senegal, South Sudan, Syria, Tanzania, Tonga, Tuvalu, Uganda, Vanuatu, Zambia, and Zimbabwe.