[JURIST] Initial reactions by Senators on both sides of the aisle prompted speculation Tuesday that Monday's nomination [JURIST report] of Under-Secretary of State John Bolton to be the new US ambassador to the UN could be problematic, or at least controversial. Senior Democrats such as Senator Joseph Biden and former Democratic presidential challenger Senator John Kerry expressed "surprise" [Biden press release] and puzzlement [Kerry website, calling Bolton's "just about the most inexplicable appointment the President could make"] at the advancement of the staunch UN critic and implacable ICC opponent [2002 speech] as America's representative to the world body, while even Republicans like Senate Foreign Relations Committee chair Richard Lugar said they would reserve judgment. Confirmation hearings for Bolton are expected in April. AP has more.