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(CNN) – Vice President Joe Biden faulted Turkey, the United Arab Emirates, and Saudi Arabia for inadvertently strengthening ISIS during a speech at Harvard last week.
He apologized to U.S. allies Turkey and the UAE on Sunday, but the former U.S. Ambassador to Iraq says Biden wasn't wrong.
"It wasn't necessarily wrong. But we need to do something about it. And the question is whether calling them out publicly is the best way to do something about it," said former Ambassador Christopher Hill, who is now dean of international studies at the University of Denver.
"Certainly we'd like to see more from all of these countries in terms of dealing with this ISIS threat. And yet they've all been very reticent. They all have their reasons for being careful about it," said Hill.
"An important element of our diplomacy needs to be to get these countries on board," he said, adding that publicly naming these countries' faults harms that diplomatic goal.
For more of our interview with former Ambassador Christopher Hill, including talk of his new book "Outpost: Life on the Frontlines of American Diplomacy," check out the video above.