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Keller @ Large: Donald Trump's Looming Speed Bump

BOSTON (CBS) -- The Donald Trump express just keeps on rolling, hitting Massachusetts for an event in Tyngsboro tonight.

But it seems there's a speed bump emerging in its path.

Remember in the last GOP debate last month, when Sen. Marco Rubio lectured the moderator that "you should ask [Trump] questions in detail about the foreign policy issues our president will confront. because you'd better be able to lead our country on the first day"?

That night, Trump's responses to foreign policy topics raised more questions than they answered.

In response to a question about the msss in Syria, the frontrunner said: "We're fighting ISIS. ISIS wants to fight Syria. Why are we fighting ISIS in Syria? Let them fight each other and pick up the remnants."

"Gibberish," says Sen. Lindsey Graham, who trashed Trump's foreign policy chops in an interview with WBZ this week. "He says we're going into Iraq and Syria to take their oil to pay for our wounded warriors. That would create World War III! Now he says let them fight it out in Syria. ISIL is a direct threat to the homeland, we can't let them fight it out, we've got to destroy them."

Trump vows to hire smart advisors and get up to speed on foreign affairs by inauguration day. But with global trouble flaring, he will likely need better answers to critics like Graham much sooner.

"I don't see a coherent foreign policy world view from Donald Trump at all," says Graham. "I hope he can mature into one but his foreign policy is a disconnected series of thoughts."

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