WASHINGTON (AP) Sept 28th, 2014 — President Barack Obama acknowledged that U.S. intelligence agencies underestimated the threat from Islamic State militants and overestimated the ability and will of Iraq’s army to fight. Questioning Obama’s strategy to destroy the group, House Speaker John Boehner said the U.S. may have “no choice” but to send in American troops if the mix of US led airstrikes and a ground campaign reliant on Iraqi forces, Kurdish fighters and soon-to-be trained Syrian rebels fails to achieve that goal. Boehner, in an interview broadcast Sunday, did agree with the White House that Obama had the power to order airstrikes in Iraq and Syria, but said he believes Congress should consider a resolution authorizing the use of force for this specific mission. Boehner said he would bring lawmakers back to Washington — they are not set to return until after the Nov. 4 election — if Obama were to seek such a resolution. Obama described the U.S. intelligence assessments in response to a question during a CBS “60 Minutes” interview that was airing Sunday night.