But the problem is, we did do something. We aided those who’ve contributed to the rise of the Islamic State. The CIA delivered arms and other equipment to Syrian rebels, strengthening the side of the ISIS jihadists. Some even traveled to Syria from America to give moral and material support to these rebels even though there had been multiple reports some were allied with al Qaeda.

Patrick Cockburn, Middle East correspondent for the London newspaper, the Independent, recently reported something disturbing about these rebel groups in Syria. In his new book, “The Jihadis Return: ISIS and the New Sunni Uprising,” Mr. Cockburn writes that he traveled to southeast Turkey earlier in the year where “a source told me that ‘without exception’ they all expressed enthusiasm for the 9/11 attacks and hoped the same thing would happen in Europe as well as the U.S.” It’s safe to say these rebels are probably not friends of the United States.

Read Rand Paul’s full op-ed in The Wall Street Journal.