JERUSALEM (Reuters) – Israel's relationship with the United States, a defining feature of the troubled Middle East, was under severe strain as diplomats scrambled on Saturday to save newborn U.S.-brokered peace talks with the Palestinians. A senior U.S. official predicted "a dicey period here in the next couple days to a couple of weeks" as Palestinians demanded the reversal of a new Israeli settlement plan and Prime Minister Benjamin Netanyahu's coalition, which includes pro-settler parties, reacts to unusually blunt criticism from Washington. U.S. Secretary of State Hillary Clinton called Israel's behavior "insulting" after it approved 1,600 new homes last week...