It's becoming a holiday tradition. It airs tonight on "20/20." And barbara is here with some of the highlights right now. You got the full tour. The full tour of the white house, with the star of the... See More
It's becoming a holiday tradition. It airs tonight on "20/20." And barbara is here with some of the highlights right now. You got the full tour. The full tour of the white house, with the star of the white house. That's not the president or the first lady. You know it's bo. You do sit down with the president and covered the news of the day, as well? We did. We talked to the two of them. They're different when they are together. about the legalization of marijuana. There's two states in which it is legal. Washington and colorado. We'll take a look. Do you think that marijuana should be legalized? I wouldn't go that far. But I what think is that, at this point, washington and colorado, you've seen the voters speak on this issue. As it is, the federal government has a lot to do when it comes to criminal prosecutions. It does not make sense from a prioritization point of view, for us to focus on recreational drug users in a state that has said, under state law, that's legal. Interesting. The president doesn't want to conflict with the states. The attorney general's fine with the decision. I asked him about the fact that when he was younger, he smokes marijuana. And what does he tell his girls? He says, don't make the mistakes I made. The only thing he can say. You talked to the president about spending that little bit of spare time he has? And you see the two of them together, quarrelling about scrabble, no less. Take a look. You have an ipad. I do. What's your favorite app? Scrabble. Oh, yeah. Gosh. Sometimes I want to yank that out of your hand. And who wins? He's good at scrabble. He's very irritating. She doesn't like losing. So, she stops playing. I don't like losing to you because you're irritating when you win. The thing that's charming this interview, which you'll see tonight, is how different they are -- when you interview them alone, they're very serious. Together, she teases him. He teases her. It's a whole other look. But then, what I found very touching, I asked the president and first lady if they had a message for robin. And, indeed, they did. Let's take a look. I want to make sure to send a big christmas greeting to robin roberts, part of your team. Absolutely. Who is just such a wonderful person. Somebody that we've, you know, come to really love. So, we're just rooting for her. Hope she's doing great. And want her to k that the whole obama crew is thinking about her. Yeah. Robin, we love you. We want robin to come back and keep doing great things. Amen to that. That's fantastic right there. Now, they were part of the interview. You also got to talk about malia and sasha, as well. Well, malia has gotten a cell phone. And the president said, one of the reasons that he says one of the reasons I'm glad that I was re-elected, I have the secret service to keep an eye on the girls, especially now that malia is old enough for boys to be calling. They used to have to call through the white house. Now, she has her own cell phone. How old is malia now? 14. By the time this term finishes, she will be 18, ready for college. And certainly ready for dating. They talked a little about the changes in their lives. There's no ground rules about the cell phone. But mrs. Obama says, she never knows when I'm going to walk into her room and see what she's texting. Parents are parents, no matter what. No question about it. We can't wait to see all of it tonight. Thank you, barbara, on "20/20." Christmas at the white house, at 10:00, 9:00 central, on abc.
This transcript has been automatically generated and may not be 100% accurate.