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Travel ban

Following the 2015 San Bernardino attack, Trump proposed to ban Muslim foreigners from entering the U.S. until stronger vetting systems could be implemented. He later reframed the proposed ban to apply to countries with a "proven history of terrorism".

On January 27, 2017, Trump signed Executive Order 13769, which suspended admission of refugees for 120 days and denied entry to citizens of Iraq, Iran, Libya, Somalia, Sudan, Syria, and Yemen for 90 days, citing security concerns. The order took effect immediately and without warning, causing chaos at airports. Protests began at airports the next day, and legal challenges resulted in nationwide preliminary injunctions. A March 6 revised order, which excluded Iraq and gave other exemptions, again was blocked by federal judges in three states. In a decision in June 2017, the Supreme Court ruled that the ban could be enforced on visitors who lack a "credible claim of a bona fide relationship with a person or entity in the United States".

The temporary order was replaced by Presidential Proclamation 9645 on September 24, 2017, which restricted travel from the originally targeted countries except Iraq and Sudan, and further banned travelers from North Korea and Chad, along with certain Venezuelan officials. After lower courts partially blocked the new restrictions, the Supreme Court allowed the September version to go into full effect on December 4, 2017, and ultimately upheld the travel ban in a ruling in June 2019.