Stephen Tankel is an associate professor at American University, an adjunct senior fellow at the Center for a New American Security, and a former senior advisor at the U.S. Defense Department. He is the author of With Us and Against Us: How America’s Partners Help and Hinder the War on Terror.
US President Donald Trump speaks during the Arab Islamic American Summit at the King Abdulaziz Conference Center in Riyadh on May 21, 2017. / AFP PHOTO / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
