Trump issued his first travel ban targeting several Muslim-majority countries in January just a week after he took office.
Trump's first ban, issued January 27, sought to bar those who would enter the U.S. from seven majority Muslim countries, then including Iraq and Sudan, during a 90-day review of U.S. vetting procedures. Announced without prior warning, it caused chaos at U.S. airports and a torrent of lawsuits objecting to the sudden exclusion of people who had a right to be in the U.S.
After an appeals court blocked Trump from enforcing the ban, the president issued a revised order that dropped Iraq and provided additional reasons for halting entry from the remaining countries. That sparked additional suits, court orders and appellate reviews.
Trump's second travel ban, issued in March, was blocked by lower courts but partly implemented by the Supreme Court.