Syrian Civil War, Chemical Weapons Use, U.S. Response: Ground Troops Ruled Out To the white house, where president obama is facing new calls for military action in syria, after releasing evidence last week that the assad regime has used chemical weapons. The white house is considering stepping up military involvement if the evidence is confirmed? Reporter: The official line is that all options are on the table. Officials have made it clear that ground troops are not going happen. They're looking at arming the rebels, targeted air strikes or a no-fly zone. The evidence needs to be corroborated. Once that happens this is a white house that is determined not to rush into any stepped up military involvement. It could take several weeks. On a much lighter note, the white house correspondents dinner over the weekend. The president honing his standup skills. I understand, second term, need a burst of new energy. But, no bounce. I really do respect the press. I recognize that the press i have different jobs to do. Frankly, I think I'm doing my job better. You know, the president seemed to be enjoying himself there. He's always been pretty good at this. Think he's gotten better, george. With the series of news events we have been through over the last weeks, month, it's a rir chance he's had to get up there and tell jokes. He did seem to enjoy it. He loves going after the press. Thank you, jon. We'll have more on the