The UN will be a significant test as to how well he continues to juggle the demands of the new politics.
Klobuchar of Minnesota will announce the suspension of her White House campaign in Dallas, Texas, where she will publicly back Biden, a campaign aide said.
For Biden and other moderates who argue that Sanders is too liberal to beat Trump and who have been trying to blunt his momentum, however, the job has become much harder.
Some of his rivals have made clear they see the televised debate as their best opportunity to subject Bloomberg, who has been rising fast in the polls, to greater public scrutiny.
Biden said Trump would have an easy time ripping into Sanders in a general election campaign, and Sanders would drag down other Democratic candidates in federal and state races.
Major issues with the app associated with releasing the Iowa caucus results led to a late reveal of the results.
The Democratic presidential hopeful added that he disagreed with BDS as a strategy to resolve the conflict because it lays all the blame at the feet of Israel.
Speaking at the sixth Democratic debate in Los Angeles, the Vermont senator also said that regarding US foreign policy, "It's not just being pro-Israel. We must be pro-Palestinian, as well."
The Trump administration, along with the government of Prime Minister Benjamin Netanyahu, has retreated in recent years from that vision
But a crucial new narrative is beginning to emerge in the Democratic race, helped along by the news that Pete Buttigieg is surging in Iowa and New Hampshire polls.