Sometimes the pressure was subtler. Richard Spertzel, a former UNSCOM specialist in biological warfare, recalled the case of an Iraqi official coyly asking a new member of his team: "How far is it from Salt Lake City to Minneapolis?" Having moved from Salt Lake City to Minneapolis just days prior to her arrival in Iraq, she was unnerved by the comment, according to Spertzel.
If that can be documented, I don't know if it counts as quite a casus belli, but it surely would be a way to make Iraq look very bad.