A member of the Saudi security forces next to a replica of a fighter jet during a daily media briefing on the Saudi-led coalition’s airstrike operation against the Houthi rebels in Yemen, April 2, 2015. Fayez Nureldine / AFP / Getty Images

John McCain, the Republican chairman of the Senate Armed Services Committee, has accused the Obama administration of going soft on Iran’s regional ambitions in pursuit of what he sees as a bad nuclear agreement with Tehran, and has praised “our Arab partners” for intervening in Yemen. “The prospect of radical groups like Iranian-backed Houthi militants” was “more than [U.S. Arab allies] could withstand,” he said. But a large contingent of senior U.S. military officers believes the Saudi-led military operation will fail, and possibly turn into a quagmire.

The fact that the Saudi-led intervention in Yemen was planned and launched independently of the U.S. was, in McCain’s eyes, a rebuke of the administration’s policies. “These countries, led by Saudi Arabia, did not notify us nor seek our coordination or our assistance in this effort,” he said during a March 26 committee hearing, “because they believe we are siding with Iran.”

A senior commander at Central Command (CENTCOM), speaking on condition of anonymity, scoffed at that argument. “The reason the Saudis didn’t inform us of their plans,” he said, “is because they knew we would have told them exactly what we think — that it was a bad idea.”

Military sources said that a number of regional special forces officers and officers at U.S. Special Operations Command (SOCOM) argued strenuously against supporting the Saudi-led intervention because the target of the intervention, the Shia Houthi movement — which has taken over much of Yemen and which Riyadh accuses of being a proxy for Tehran — has been an effective counter to Al-Qaeda.

Michael Horton, a Yemen expert close to a number of officers at SOCOM and a consultant to the U.S. and U.K. governments, picked up on this debate. Within days of the Saudi intervention’s start, he said in an email that he was “confounded” by the intervention, noting that many in SOCOM “favor the Houthis, as they have been successful in rolling back AQ [Al-Qaeda] and now IS [the Islamic State in Iraq and the Levant, or ISIL] from a number of Yemeni governorates” — something that hundreds of U.S. drone strikes and large numbers of advisers to Yemen’s military had failed to accomplish.

Later, in a telephone interview, Horton expanded on that. “These constant reports that the Houthis are working for the Iranians are nonsense, but the view is right out of the neocon playbook,” he said. “The Israelis have been touting this line that we lost Yemen to Iran. That’s absurd. The Houthis don’t need Iranian weapons. They have plenty of their own. And they don’t require military training. They’ve been fighting Al-Qaeda since at least 2012, and they’ve been winning. Why are we fighting a movement that’s fighting Al-Qaeda?”