The Trump administration has expanded its ban on entry into the US to people holding passports issued by the Palestinian Authority, Syria and six other countries, citing national security and public safety concerns.

The proclamation issued on Tuesday by President Donald Trump also adds Burkina Faso, Mali, Niger, South Sudan, Laos and Sierra Leone to a list of 12 countries whose nationals are subject to an entry ban enacted earlier this year. It also expands to 19 a list of nations that are subject to partial entry restrictions.

The document states that the policy was necessary to “advance” immigration, foreign policy, national security and counterterrorism objectives; to keep out insufficiently vetted travellers; and to “garner co-operation from foreign governments”.