General Martin Dempsey says that once he determines that the Islamic State militants in Iraq have become a direct threat to the US homeland or Europe, he will recommend the US military move directly against the group in Syria.
But the chairman of the Joint Chiefs of Staff said that right now, he still believes the insurgent group is still more a regional threat and is not plotting or planning attacks against either the US or Europe.
Speaking on a military plane en route to Afghanistan, Dempsey provided more detail into his thinking about the Islamic militants who have stormed across Iraq, operating out of safe havens in Syria.
So far, the Obama administration has restricted its military action against the militants to specific operations within Iraq, but concerns have increased as the Islamic State group extended its reach, taking control of a swath of land stretching from Syria across the border and deep into western and northern Iraq.
The group took over Iraq's second largest city, Mosul, in June, and has since declared an Islamic state, or caliphate, in territory under its control in Iraq and Syria.
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Dempsey also told reporters travelling with him that he believes that key allies in the region - including Jordan, Turkey and Saudi Arabia - will join the US in quashing the Islamic State group.
"I think ISIS has been so brutal, and has wrapped itself in a radical religious legitimacy that clearly threatens everybody I just mentioned, that I think they will be willing partners," said Dempsey, expressing optimism for the first time that the Arab nations would join in the conflict. ISIS is an acronym for the Islamic State group.
He contrasted the Islamic State group to the Yemen-based al-Qaeda in the Arabian Peninsula, which has plotted and attempted attacks against the US and Europe. As a result, the US has conducted counterterrorism strikes against the group within Yemen.
Dempsey said that so far, there is no sign that the Islamic State militants are engaged in "active plotting against the homeland, so it's different than that which we see in Yemen".
"I can tell you with great clarity and certainty that if that threat existed inside of Syria that it would certainly be my strong recommendation that we would deal with it," said Dempsey.
"I have every confidence that the president of the United States would deal with it."
