American activists opposed to Turkish President Recep Tayyip Erdogan want to know if he personally ordered the violent disruption of a protest Tuesday in the U.S. capital, and say President Donald Trump needs to stand up for them. Video released Thursday shows that Erdogan watched his supporters, including members of his security detail, charge toward protesters in the grassy Sheridan Circle, punching and kicking them before police restored order. Just before chaos erupted, an aide bent over Erdogan, who was seated in the back seat of a car in the driveway of the Turkish ambassador's home. The aide communicated with...