The mess we face today is a direct result of Barack Obama unilaterally sending our military there without Congressional approval, after saying he did not have that authority. If we did not get ourselves entangled in this mess in the first place, we would not need to have a debate now about withdrawing our troops.
If Congress thinks we need to have our military in Syria, they should put on their big boy pants on and do their jobs. Pass an authorization to use military force. Stop ceding your power to the executive branch, you cowards.