U.S. Senate Foreign Relations Committee Democrats said on Sunday their party likely will not be able to block John Bolton's nomination as U.S. ambassador to the United Nations but want more information before agreeing to a vote, Reuters said. The Senate returns this week from recess and again will face the contested nomination, which has twice been delayed by Democratic concerns about Bolton, the top U.S. diplomat for arms control they say has a record of abusive, erratic behavior that should disqualify him for the sensitive diplomatic job. Asked if Democrats would have enough votes to sustain a filibuster, a procedural hurdle used to block action and thereby block the confirmation vote, Sen. Joseph Biden of Delaware, the top Democrat on the panel, said, "I'm going to be completely straight with you. I'm not at all certain we do." Sixty votes are needed to end debate and go to a final vote in the full Senate, which Republicans control 55-45. "(Bush) will probably be able to win the vote somewhere between 45 and 47 votes against and he'll think it's a victory," Biden told ABC's "This Week" program. --More 2336 Local Time 2036 GMT