People hold up signs during a protest against US President Donald Trump's immigration rules at the Reagan National Airport in Arlington, Virginia on February 1, 2017.
Trump's order bans the arrival of citizens from Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen for at least 90 days. All refugees are barred for 120 days, while Syrian refugees are blocked indefinitely. / AFP / Paul J. Richards        (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)