AP: An open diplomatic row during the visit of Vice President Joe Biden has shined a spotlight on the U.S. failure to rein in Israeli settlement ambitions and deepened Palestinian suspicions that the United States is too weak to broker a deal. Biden's handshakes and embraces gave way to one of the strongest rebukes of Israel by a senior U.S. official in years after Israel's announcement during his visit that it plans to build 1,600 homes in disputed east Jerusalem. Israel apologized for the poor timing but is sticking to its plan to build the homes, enlarging one of the settlements that have impeded negotiations with Palestinians.