The Trump administration announced new restrictions Sunday on visitors from eight countries — an expansion of the pre-existing travel ban that has spurred fierce legal debates over security, immigration and discrimination.

In announcing the new rules, officials said they are meant to be both tough and targeted. The move comes on the day the key portion of President Trump’s travel ban, one which bars the issuance of visas to citizens of six majority-Muslim countries, was due to expire. …

Three new nations were added to the list of countries whose citizens will face the restrictions: Chad, North Korea and Venezuela — although the restrictions on Venezuela are narrowly crafted, targeting that country’s leadership and their family members.

One country, Sudan, fell off the travel ban list issued at the beginning of the year. Senior administration officials said a review of Sudan’s cooperation with the U.S. government on national security and information-sharing showed it was appropriate to remove them from the list.

The new restrictions will be phased in over time, officials said, and the restrictions will not affect anyone who already holds a U.S. visa. For those visitors affected by the changed restrictions, the new rules will go into effect Oct. 18, according to the proclamation.