As PRESIDENT, Dr. Paul has been clear.
He will follow the WORD of the constitution, not how he feels.
He would only engage in a military expedition if he received a Declaration of War from Congress or a letter of marque and reprisal.
End of story.
If he received one, he would execute it, kick @$$ and come home, irregardless of how he FELT about it or how libertarian or non-libertarian the effort was.