It is a regrettable loss, as Bolton has displayed exceptional effectiveness and won unexpected praise from many of those who he has dealt with:

WASHINGTON (Reuters) - U.S. Ambassador to the United Nations John Bolton announced on Monday he will give up his job in days after he was unable to satisfy Senate opponents concerned he would pursue a unilateral U.S. foreign policy.

Bolton's attempt to hang on to his diplomatic post, already tenuous, became even more problematic after Democrats who had blocked his nomination won control of the Senate in November elections. Bolton has held the job on a temporary basis.

Bolton had a history of angering diplomats and colleagues in his previous State Department job and could not gain sufficient support from the Senate Foreign Relations Committee to stay on despite winning praise from some envoys at the United Nations.