 Top stories on WTOP. D.C. leaders are warning all of us behind the wheel to expect disruptions when next week's NATO Summit takes place at the D.C. Convention Center starting July 9th. There's a new top cop in Montgomery County, Mark Yamada, sworn in as the county's 18th police chief. Keep it here for full details. I'm going next to Bob Imler. He's in the WTOP Traffic Center.