It now applies to Iran, Libya, Somalia, Syria, Yemen and North Korea.
President Donald Trump lifted a U.S.travel ban on citizens from Chad on Tuesday after a six-month USA government review found improvements in the African country's security standards, the White House said.
The Secretary's report noted that Libya had made progress toward compliance but that lifting of the restriction for that country could not be recommended at this time.
The central African country was put on the controversial list a year ago because, according to officials, it had "significant" terrorist presence in its borders and was not "adequately" sharing security-related information with the Americans.
The review was based on the enhanced global security measures that DHS and the Department of State established, the first ever set of minimum requirements for worldwide cooperation in support of our visa and immigration vetting and adjudications.
"The administration has recorded notable improvements in identity management and information sharing", the department said.
The State Department spokeswoman Heather Nauert, said the travel restrictions placed on Chad will be terminated Friday, adding that the "improved practices" by Chad "demonstrate a clear off-ramp for countries placed on the travel restriction list". During his visit to Chad in March, Secretary of State Rex Tillerson, who has since been fired, faced repeated questions on why the country still faced the travel ban. One of the reasons given for Chad's inclusion in the ban was its inability to supply homeland security officials with recent passport samples. These travel restrictions help prevent potential terrorists and criminals from reaching our shores and encourage foreign governments to live up to their obligations to enhance security and share essential information with the United States.
The Supreme Court is expected to decide the legality of Trump's travel bans in the coming months.