Bolton to exit as UN ambassador
"President George W. Bush appointed Bolton largely because of a commitment to reform the world body. But Bolton's outspokenness and prickly manner often angered the diplomatic community and some of his fellow U.N. ambassadors at times found him difficult to work with."

Now that's funny I don't care who you are! "Appointed Bolton largely because of a commitment to reform..." Bolton always saw the UN as nothing but an extension of US foreign policy. In fact he has said many times that it is no longer relevant and a waste of time. He wasn't about reforming it, but destroying it. And that "prickly manner" is a euphemistic way of describing an extremely aggressive approach to human interaction. Read the whole article though. It sounds like it was written by a Bush administration official nearly verbatim. And it wasn't just Democratic senators opposed to Bolton. Many Republicans also despised his approach.