say, show, it's up to the chief justice in the first instance to rule on any evidentiary question but he doesn't have to. the chief justice if a question comes to him he thinks is maybe too political he could decide to punt that question to the whole senate body. and in another case, if he did decide to rule on an evidentiary question the senate could easily overrule the chief justice with just 51 votes if they wanted to. in that way it's very much the senate's show. >> in what circumstances -- by the way, this is great. i love you're able to run through each of these instances that are in my mind as an attorney wondering what the heck is about to unfold. what matters more? 51 votes in the circumstance you just described, or two-thirds, 67 votes, in other circumstances? >> right. well, it really depends on what you're after. democrats need 67 votes to remove the president from office. but they'll only need 51 votes to introduce new witnesses and potentially expand the house