ron stallworth, thank you for sharing this story., the book is "black klansman," and you can order it yourself at blackklansman.com. we'll be right back. [ girl ] my mom, she makes underwater fans that are powered by the moon. ♪ she can print amazing things, right from her computer. [ whirring ] [ train whistle blows ] she makes trains that are friends with trees. ♪ my mom works at ge. ♪ trwith secure wifie for your business. my mom works at ge. it also comes with public wifi for your customers. not so with internet from the phone company. i would email the phone company to inquire as to why they have shortchanged these customers. but that would require wifi. switch to comcast business internet and get two wifi networks included. comcast business built for business. >>> up next, some poetic justice for a republican politician at the polling booth. stay with us. you always have. live healthy and take one a day men's 50+. a complete multivitamin with 7 antioxidants to support cell health. age? who cares. thmortgage didn't start here. i

ron stallworth is the author of black klansman.e first black detective in your department. why did they have you do it? why not get one of the white cops to infiltrate the kkk? >> well, i was the officer on duty at the time. first of all, how are you? watch your show all the time. i was the officer on duty at the time. and i was the one that saw the ad in the newspaper, in the classified section, and i responded to the ad. i didn't think it was going to amount to anything. >> how does it even read? >> it read ku klux klan for information, and then there was a post office box underneath. so i wrote a letter. and used all the buzz words of that that they like to hear and like to use and said i was interested in getting more information, and then i made a critical error, i signed my real name instead of the undercover name i usually used. but i signed my name. gave the undercover phone line, and gave the undercover post office box address and mailed the letter off. >> too late to turn back. when my team and i first heard about this, w

last week, i interviewed ron stallworth, a former police detective who went undercover as a member ofhe ku klux klan. as i said at the time, i could have spent much more time asking him about his amazing experience. and now he's agreed to let you continue the interview. if you have a question, head over to our website. that's politicsnation.msnbc.com, and he's answer them in the coming days. >>> coming up, president obama's opportunity for young men of color takes a big step today. we'll talk to a supervisor from the chicago program that inspired the plan. and one of trayvon martin's friends, someone we all know, we all came to know, she keeps her promise to him. big news on that ahead. tomorrow. quick look at the weather. nice day, beautiful tomorrow. tomorrow is full of promise. we can come back tomorrrow. and we promise to keep it that way. driven to preserve the environment, csx moves a ton of freight nearly 450 miles on one gallon of fuel. what a day. can't wait til tomorrow. ugh. heartburn. did someone say burn? try alka seltzer reliefchews. they work just as fast and taste bett