President Donald Trump on Sunday slapped new travel restrictions on citizens from North Korea, Venezuela and Chad, expanding to eight the list of countries covered by his original travel bans that have been derided by critics and challenged in court.
Iran, Libya, Syria, Yemen and Somalia were left on the list of affected countries in a new proclamation issued by US president.
Trump's original ban was highly controversial, as it affected six majority-Muslim countries, and was widely labelled a "Muslim ban".
It was subject to a range of legal challenges and the subject of several large-scale protests, and is due to be considered by the US Supreme Court in October, having been partly reinstated in July.
"We are taking action today to protect the safety and security of the American people by establishing a minimum security baseline for entry into the United States," Trump said in a statement.
"We cannot afford to continue the failed policies of the past, which present an unacceptable danger to our country. My highest obligation is to ensure the safety and security of the American people, and in issuing this new travel order, I am fulfilling that sacred obligation."
The restrictions come into effect on 18 October, but will not apply to those already in possession of a valid visa, the White House said.