Rich primary on tuesday. One of marco rubios biggest obstacles donald trump, whose popularity grows, despite a distring of divisive string of divisive comments. Coming up, the trump effect, the topic of the week ahead. We begin this evening with a deadly bombing in turkey, a core bomb on the streets of ankara, 34 killed, 125 more wounded. Turkish government officials believing militants carried out the attack. So far theres no claim of responsibility. Paul brennan has more. The bombers targeted an area of a park and a care. An area comprise ing a bus station, commercial center and gardens, timed to strike at the crowds. There were chaotic scenes in the aftermath. In a statement the Governments Office says the blast was caused by a car bomb. Other reports suggested it was a suicide attack. The Prime Minister convened an Emergency Security meeting. The area is close to government buildings. A fleet of ambulances treated many victims, fire crews brought in to douse the flames and deal wit