Former Pentagon chief rips Trump's foreign policy
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Former Secretary of Defense Robert Gates on Sunday criticized Donald TrumpDonald TrumpBiden says Roe v. Wade under attack like 'never before' On student loans, Biden doesn't have an answer yet Grill company apologizes after sending meatloaf recipe on same day of rock star's death MORE's foreign policy after the Republican presidential front-runner outlined his "America first" model.

"I think, based on the speech, you'd have somebody who doesn’t understand the difference between a business negotiation and a negotiation with sovereign powers," Gates said on ABC's "This Week."

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Gates, who served as secretary of Defense under former President George W. Bush and President Obama, called Trump out for making conflicting statements in last week's speech.

"For example, he, on the one hand, says we need to be a more reliable ally to our friends," he said.
 
"And then in the next breath, he basically says we're going to rip up all those burden-sharing agreements that we've had over the decades with them and make them go their own way if they don't pay for everything."
 
Gates said, however, "it's hard to disagree with" some of Trump's comments, pointing to the billionaire's statement that allies "ought to be doing more."
 
"But how do you get them there when you're dealing with 28 sovereign countries?" he asked.
 
"And nobody argued harder for them to do more than I did, but how do you actually get these countries, many of which have weak governments, to agree to things that are very difficult?
 
"He doesn't understand that there's a give-and-take in international relations that is different than in the business community."
 
Gates also said it worries him that Trump doesn't "appear" to listen to people.
 
"He believes that he has all the answers, that he's the smartest man in the room."
 
He contrasted the Republican front-runner to past presidents, saying they have all been willing to listen to people who had experience with the issues at hand before making their decisions.
 
"Now, they've gone in different directions, but they never assumed they had all the answers," he said. "And that's one of the things that troubles me."
 
He also said a lot of leaders around the world are "quite concerned" about a Trump presidency. 
 
"His unpredictability, his lack of understanding of the complexity of international affairs, his threats, his claims that he's going to make other countries do things when in fact the president of the United States does not have the power to make them do things," he said.