I'll give Falk the benefit of the doubt and assume that by "bipartisan call" he's talking about those Representatives and Senators who are advocating unilateral action.
I'll give you the benefit of the doubt that you are unaware of the use of the word "bipartisan" in the U.S. media to mean "supported by both Republicans and Democrats."
It has nothing to do with the Executive Branch of the government, which is never "bipartisan", but always either Republican or Democratic.
I'll also give you the benefit of the doubt that you are blissfully unaware that the UN Security Council has been doing the bidding of the United States for at least the last dozen years. Any intervention will be "United Nations" in name only.