GOP debate: Donald Trump makes crude joke about his hand size

<p>In an effort to unseat GOP front-runner Donald Trump, Marco Rubio has unleashed a volley of personal attacks out on the campaign trail recently. </p><p>"I'll admit he's taller than me. He's like 6'2", which is why I don't understand why his hands are the size of someone who's 5'2". … And you know what they say about men with small hands: You can't trust them," <a href="http://www.cbsnews.com/news/marco-rubio-goes-after-donald-trumps-small-hands/" target="_blank">Rubio joked</a> at a rally.</p><p>But Rubio said at <a href="http://www.foxnews.com/live-coverage/fox-news-gop-debate" target="_blank">the debate</a> he'd prefer to focus on political issues:</p><p>"I would much prefer to have a policy debate. I hope that's what we'll have here tonight." </p><p>That didn't last long. After some back-and-forth with the billionaire, Rubio started mocking Trump for some of his past failed business ventures.</p><p>"You've bankrupted four companies. Have you ever heard of Trump Steaks? Have you ever heard of Trump Vodka?" Rubio asked.</p><p>Then it just got weird when Rubio and Trump made up insulting nicknames for each other while talking about economic policy.</p><p>"Don’t worry about it, Little Marco, I will," Trump said. </p><p>"All right, let's hear it, Big Don, Big Donald," Rubio responded.</p><p>So much for a policy debate.</p><p><i>This video includes clips from </i><i><a href="http://www.cbsnews.com/news/marco-rubio-goes-after-donald-trumps-small-hands/" target="_blank">CBS</a></i><i> and </i><i><a href="http://www.foxnews.com/live-coverage/fox-news-gop-debate" target="_blank">Fox News</a></i><i> and images from Getty Images.</i></p>