U.S. President Donald Trump has directed restriction of immigration from six additional countries, citing security concerns.

The six countries includes: Nigeria, Myanmar, Eritrea, Kyrgyzstan, Sudan and Tanzania. The new rules come into effect on February 22nd.

The rules stop short of a blanket travel ban and will still allow certain visits to the U.S., notably those for non-immigration purposes, which raised questions about how the administration was defining security concerns.

The restrictions are largely focused on immigration visas that can lead to the ability to settle permanently in the U.S., and not on visits for familiar purposes or for business, in most cases.

The rules are being imposed ahead of elections later this year and come three years after Trump slapped a travel ban on several Muslim-majority nations, sparking an uproar.

The ban, which was modified, was later upheld by a court ruling.