consults anybody. well, 97% of the scientists in the world say that global warming and the threat of the cap melting is real. and i would take their word over mr. trump's untutor opinion. >> the issue of gun control is another big one. and democratic candidate beto o'rourke got a lot of attention this week for his support of a mandatory buyback for semiautomatic weapons. here he is thursday night. >> i am, if it's a weapon that was designed to kill people on a battle field. if the high-impact, high-velocity round when it hits your body shreds everything inside of your body because it was designed to do that, so that you would bleed to death on a battle field, hell, yes, we're going to take your ar-15, your ak-47. we're not going to allow it to be used against fellow americans anymore. >> o'rourke doesn't believe average citizens need a weapon that's designed to kill people on the battlefield. do you agree with him?