Trump Signs Executive Order — 'Muslim Ban' Blocks Travel from 7 Muslim-Majority Countries (2017-01-27)

Trump signs Executive Order 13769 banning entry into the US from seven Muslim-majority countries (Iran, Iraq, Libya, Somalia, Sudan, Syria, Yemen) and suspending refugee admissions. The order causes chaos at airports worldwide as travelers are detained. Federal courts block the order, leading to a revised version. The Supreme Court ultimately upholds a third version in 2018. Trump calls it 'extreme vetting' and later retweets anti-Muslim videos from a British far-right group.