Democratic presidential nominee Hillary Clinton today targeted her Republican rival Donald Trump for being a man who can be provoked easily and should not have his fingers near the nuclear codes.<br/><br/>During the first of the three presidential debate, Ms. Clinton said Trump's cavalier" attitude about nuclear weapons, the number one threat in the world, is "deeply troubling. <br/><br/>The 68-year-old former secretary of state insisted that Trump is not fit to be the next US President. <br/><br/>Trump on the other hand, while acknowledging that nuclear armament is the single greatest threat, ruled out taking out nuclear option off the table.