If Congress says "no," then it is not out of bounds to consider impeachment.
But if Congress says "proceed," or if they simply remain silent, then the validity of an impeachment effort is not quite so clear.
Either way, it would be folly to bother to even contemplate YOUR "advice."
Maybe Syria isn't the only impeachment possibility?
"In his conduct of the office of President of the United States, Barack Hussein Obama, in violation of his constitutional oath faithfully to execute the office of President of the United States and, to the best of his ability, preserve, protect, and defend the Constitution of the United States, and in violation of his constitutional duty to take care that the laws be faithfully executed, has usurped the exclusive power of Congress to initiate war under Article I, section 8, clause 11 of the United States Constitution by unilaterally commencing war against the Republic of Libya on March 19, 2011, declaring that Congress is powerless to constrain his conduct of the war,
and claiming authority in the future to commence war unilaterally to advance whatever he ordains is in the national interest.
"By so doing and declaring, Barack Hussein Obama has mocked the rule of law, endangered the very existence of the Republic and the liberties of the people, and perpetrated an impeachable high crime and misdemeanor as hereinafter elaborated."
Articles of Impeachment