cadillac ct6. >>> new york, 20 million people strong. no, we don't all look the same, we don't all sound the same, either. but when we pull together, we do the biggest things in the world. so when some say we can solve america's problems by building walls, banning people based on their religion, and turning against each other, well, this is new york and we know better. i'm hillary clinton and i approve this message. >> maybe it's just my upper west

t-i-a-a. >> they're hearing about a guy running for the president of the united states talking about nuclear weapons. they don't want to hear about that. >> why do we make them? >> because of the old mutually assured destruction which reagan hated. can you tell the middle east we're not using nuclear weapons. >> i would never take any of my cards off the table. >> how about europe? we won't use in the europe? >> i won't take it off the table for anything. >> you might use in the europe? [ laughter ] >> no. >> i'm just saying -- >> i'm not taking cards off the table. >> one of the many headlines yesterday, the msnbc town hall with donald trump as chris matthews talked to him there. the republican front-runner refusing to rule out using nuclear weapons in europe, joining us now economist jeffrey sachs, he's advised bernie sanders' presidential campaign on foreign policy. >> that's a great way to start the day, huh?