President Donald Trump on Wednesday issued a sweeping new travel ban for people from several countries, citing national security risks.

The ban fully restricts people from Afghanistan, Burma, Chad, Republic of the Congo, Equatorial Guinea, Eritrea, Haiti, Iran, Libya, Somalia, Sudan and Yemen from entering the United States. The president is also partially restricting and limiting U.S. entry for nationals of Burundi, Cuba, Laos, Sierra Leone, Togo, Turkmenistan and Venezuela.

The administration’s travel ban has been in the works for months, following through on a Day One executive order that directed agencies to identify countries where vetting visitors and visa applicants is considered infeasible and poses a threat to national security. The extensive planning speaks to the White House’s efforts to pass legal muster: Trump’s 2017 travel ban targeting majority-Muslim countries suffered a series of courtroom defeats before a slimmed down version eventually took effect.