Ben Carson on Tuesday called it the "height of hypocrisy" for the United States to ask Turkey to seal its border with Syria to keep Islamic State fighters out of the country, since the U.S. has failed to control the southern border with Mexico.

Appearing on "Fox and Friends" Tuesday after his trip to the Middle East, Carson told host Steve Doocy that the U.S.'s southern border, like the Turkey/Syria border, is "completely porous."

"Yes, it would be good to seal off the border so that there wasn't such a flow of people into the ranks of ISIS, but by the same token, you look at our border, it is completely porous," Carson said.

"Terrorists can come here also. I've been down there. I mean, I was astonished by how little protection there is and all of the drugs that are coming through," Carson continued. "So for us to sit there and proclaim sanctimoniously that you should close your border while we haven't done that to protect the American people seems to me the height of hypocrisy."

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