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Let's bring in constitutional attorney david rivkin. he served in the white house counsel's office during the reagan and george h.w. bush administrations. david welcome. thank you for coming today. so, david, how strong is this president's case for saying that his aides don't have to testify because of this immunity? >> very strong. it is a well established immunity, paul. it dates back to 971. 1971. the opinion written by a young william rehnquist who, as you know, went on to be a chief justice of the united states. been reaffirmed in nine administrations under both parties, it's a very simpl...

It can lift debris from the surface for heavier items like the engine. it attaches high strength recovery lines that are lifted from the boat. bottom line, this technology eric can only be used, though, if investigators know where to start looking. >> and they have about two weeks -- those pings are fascinating, never really heard them before. brian? thank you so much. >> now to the new questions that are being raised today over president obama's handling of the crisis in ukraine. critics wondering whether the president could have taken a tougher stance against russian president vladimir putin...