pulse.msnbc.com/america. now let's bring in msnbc chief legal correspond end ari melber and the author of "how to catch a russian spy." you've been digging deep on this and what's the downside from the senate or the house granting immunity here long term? >> immunity can mean more than one thing. one is the congressional committees using their authority to grant immunity for the testimony that's provided basically saying whatever you say won't be held against you. remember that's the opposite of what you see on the crime shows. whatever you say can be and will be held against you. the other one is the other one that prosecutors provide. that is where you actually say, you're going to immunize someone for potential prosecution for cooperation. participants under the law are granted immunity for testifying for the federal government and that refers to the idea that the