special thanks to all of you. a lot of experts on this panel. coming up, my special guest tonight, the man who literally wrote the rules that govern bob mueller. neil catchual is on "the beat" and talks about what could let to indicting a sitting president. >> also, nothing wrong with getting dirt from the russians. >> nothing ill legal about that. whether it comes from a russian or german, doesn't matter. congressman joaquin castro is here to discuss donald trump's attacks on ms-13 and immigrants in general. and a special guest tonight on the woman who could be the next attorney general in donald trump's home state of new york. you're watching "the beat" on msnbc. as a control enthusiast,