Who in their right mind would bring this up! We have been a permanent member of the Security Council since the end of WWII. There's a reason there hasn't been another world war. The U.S is a prominent world power and every country in the world is watching us. What kind of message would we be sending by withdrawing? Not to mention, do we really want the UN military in the hands of China and Russia without our veto power? You can't solve problems by running away and people who can't see that are cowards. If you're not going to face your problems decisively and head on, you shouldn't be in government.