[JURIST] Following heated confirmation hearings last week, a showdown vote by the Senate Foreign Relations Committee [committee website] is set for Tuesday over John Bolton [official profile], President Bush's nominee for the UN ambassador. Bolton has been characterized by his critics as hot-tempered and abusive of subordinates, and has been accused of concealing information from superiors in the State Department. His outspoken criticism of the UN bureaucracy have also come under fire, but colleagues in the State Dept. have come to Bolton's defense [JURIST report]. Democratic members of the Foreign Relations Committee plan to vote against Bolton on Tuesday, but their hopes of defeating the nomination depend on persuading one or both of two wavering Republicans — Sens. Chuck Hagel (R-Neb.) and Lincoln Chafee (R-R.I.) — to vote against him. AP has more.