Clinton, Trump escalate fight in dramatic week on national security

By Steve Holland and Jeff Mason WASHINGTON/NEW YORK (Reuters) - Presidential candidates Donald Trump and Hillary Clinton clashed over national security again on Friday, with Trump calling his Democratic rival "trigger-happy" and Clinton arguing his proposals would make the world a more dangerous place. The two White House hopefuls have waged a running battle this week over who is best placed to command the world's most powerful military, with both touting their support from retired military lead