Donald Trump thinks he could teach the secretary of defense 'a couple things' about military strategy

In further evidence Donald Trump is a self-proclaimed expert on every topic under the sun, the GOP nominee offered Wednesday to give Defense Secretary Ash Carter some advice on how to best defend the nation. During an interview with ABC News' George Stephanopoulos, the host reminded Trump that Carter had said Trump doesn't "know a damn thing about military strategy." Trump's response? "I'll teach him a couple of things."

Trump then launched into an explanation of how the military offensive to retake the Iraqi city of Mosul from the Islamic State should've been handled. "I've been hearing about Mosul now for three months. 'We're going to attack, we're going to attack,'" Trump said. "Why do they have to talk about it?"

Instead, the businessman advised, the military should have prioritized secrecy. "Don't talk about it," Trump said. "Element of surprise. General George Patton."

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Listen to the rest of Trump's advice to Carter, a former physicist and Harvard professor who has been working on national security issues since the '90s, below. Becca Stanek