Trump bans 7 Muslim countries Syria, Iraq, Iran, Sudan, Libya, Somalia and Yemen.
Even green card holders (visiting & are from the banned counties) will not be allowed back until they are reassesed.
British citizens travelling to America on UK passports will be blocked from entering if they have dual-citizenship with countries targeted.
Extreme vetting’ for Pakistan, Afghanistan and SaudiArabia visitors.
Iran ban US citizens.
Dubai some sources state are looking through legislation into banning US citizens.