The despicable attack at Istanbul's Ataturk International Airport that killed dozens and injured several certainly bears the "hallmarks" of the Islamic State's depravity, Brennan said here yesterday.
"We've seen ISIL (Islamic State) carry out and incite an array of terrorist attacks in the region, directly, indirectly and I would be surprised that ISIL is not considering carrying out these attacks in the near abroad as well as the far abroad," he said.
"And the United States, as we well know, is leading the coalition to try to destroy as much of this poison, inside of Syria and Iraq, as possible. So it would be surprising to me that ISIL is not trying to hit us, both in the region as well as in our homeland," Brennan said while to replying to a question at the Council on Foreign Relations, a top American think-tank.
"So if anybody here believes that, you know, the US homeland is hermetically sealed and that Daesh or ISIL would not consider that, I think-I would guard against that," he added.
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Brennan said global instability is one of the defining issues of the time, and its implications are hard to overstate.
"As instability spreads, extremists and terrorists are finding sanctuary in ungoverned spaces. Energy supplies are being disrupted. Political reform is suffering as too many governments opt for authoritarian measures at the expense of democratic principles and respect for human rights," the CIA official said.