To view this site, you need to have Flash Player 9.0.115 or later installed. Click here to get the latest Flash player.
(NECN/NBC News: Tracie Potts) - Lawmakers are looking for answers on whether the U.S. has been snooping on its allies, for how long and who knew about it.
One of the key witnesses at Tuesday's intelligence hearing will be General Keith Alexander, head of the National Security Agency.
Tuesday the House Intelligence Committee hears from the head of the NSA, the director of National Intelligence and the Justice Department on what type of surveillance the National Security Agency can and cannot do.
The White House says President Obama didn't know the NSA was monitoring phone calls of world leaders, including Germany's Angela Merkel.
James Lewis said, "Was Obama calling up Keith Alexander and saying ‘I want you to listen to Angela Merkel?’ No way."
Rep. Jason Chaffetz said, "I don't think it’s good enough for the President and the team around him to just claim ignorance."
In an interview on "America with Jorge Ramos" on the cable network Fusion, the president admitted: the buck stops with him:
President Obama said, "I'm initiating now a review to make sure that what they're able to do doesn't necessarily mean what they should be doing."
As part of that review, a senior administration official says they're looking at no longer spying on heads of state - but a final decision hasn't been made.
Germany's calling for an investigation.
White House Press Secretary Jay Carney said, "We are mindful that some of these disclosures have caused tension in our relationships."
In a statement, the head of the Senate Intelligence Committee, Democrat Dianne Feinstein, says the U.S. should not be snooping on its allies.