What does the idiom in this text suggest?
In September 2013, President Obama stated that he was on the fence about ordering a military strike against Syria.

 - The president was firmly against the military strike.
 - The president was undecided about the military strike.
The text uses an idiom, an expression that cannot be understood literally.
The idiom on the fence suggests that the president was undecided about the military strike. If you are on the fence, you are on neither one side nor the other. In other words, you are torn or unsure.