FILE- In this Sunday, Jan. 29, 2017 file photo, demonstrators hold signs during a protest against President Donald Trump's executive order banning travel to the U.S. by citizens of Iraq, Syria, Iran, Sudan, Libya, Somalia or Yemen, at Philadelphia International Airport in Philadelphia. Just two days after banning travelers from seven Muslim-majority nations, U.S. President Donald Trump invited the Saudi monarch, whose kingdom includes Islam’s holiest sites, to fly to Washington. It points to the delicate balancing act Trump faces as he tries to deliver on campaign promises to exterminate “radical Islamic terrorism” without endangering political and economic ties with U.S. allies in the region, many of which are countries where the Trump Organization has business interests. (AP Photo/Corey Perrine, File)