Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Washington (CNN) -- House Speaker John Boehner blasted President Barack Obama on Thursday for saying no U.S. combat troops would be placed on the ground in the fight against ISIS in Syria. "An F-16 is not a strategy. Airstrikes alone will not accomplish what we're trying to accomplish," Boehner told reporters in his weekly media briefing. "The President has made clear that he doesn't want U.S. boots on the ground. Well, somebody's boots have to be on the ground," he continued. "And so I do believe that what the President has asked for, as the commander in chief, he has this authority to train the Syrian rebels, and frankly we ought to give the President what he's asking for."House Speaker John Boehner says the President's ISIS plan is not enoughObama's plan includes airstrikes against ISIS in Syria and training some Syrian rebelsStill, Boehner says he thinks Congress should authorize the President's plan 
 Question:"If our goal is to eliminate _, there's a lot of doubt whether the plan that was outlined by the President last night is enough to accomplish that mission."

ISIS