Rep. Chris van Hollen : Three lessons from Iraq can guide intervention in Syria . He says President Obama must present clear evidence of Assad regime culpability . He says U.S. must take strong action to overthrow Assad regime , including use of chemical weapons . Moreover , defining the success of our response as decisively changing the military balance is unrealistic , unachievable without putting American lives at risk , and will ultimately drag the United States toward full-scale intervention in a Syrian civil war . Van Allen : Mission must be clearly defined and achievable at an acceptable cost .
Rep. Chris van Hollen : Three lessons from Iraq can guide intervention in Syria . He says President Obama must present clear evidence of Assad regime culpability . He says U.S. must take strong action to overthrow Assad regime , including use of chemical weapons . Van Allen : Mission must be clearly defined and achievable at an acceptable cost .