subject. >> i'm done answering those questions. i've answered about 15 times in terms of my view on it. >> now there's another challenge for republicans, figure out how to take on trump before they face off head to head in the first republican debate on august 6th. john? >> you can bet their practicing already. sarah murray appreciate it. i want to get back to our breaking news. chattanooga attacks, was it inspired by isis. wolf that will be a subject on "the situation room"? >> he left now doubt the chairman of the house homeland security saying this is a isis inspired attack. we have key members of the house homeland security committee. there very latest at the top of