when they fail in this purpose, they become the dangerously structured dams that block the flow of social progress." then hillary clinton added "this is a subtweet." a subtweet is when you're talking about something without naming them, presumably secretary clinton was talking about senators joe madgein and kyrsten sinema. as you know, much of that letter is about how allies of the civil rights movement could be more problematic than enemies of the civil rights movement, the white moderate. do you agree with that comparison and is that what's happening today in the u.s. senate? >> i do believe, agree with that. today is sunday. remember, king was sitting in jail, he received a letter from eight white clergymen who wrote him about their concern. they asked him to leave birmingham, and they said that they thought his cause was right, but his timing was wrong and king said to them, time is