JERUSALEM (Reuters) - Israeli Prime Minister Benjamin Netanyahu faces an even more awkward time with Washington and re-energized critics at home who accused him on Wednesday of backing the loser in the U.S. presidential election. With Iran topping his conservative agenda, Netanyahu will have to contend with a strengthened second-term Democratic president after four years of frosty dealings with Barack Obama and a rift over how to curb Tehran's nuclear program. Obama victory spells trouble for Israel's Netanyahu - Yahoo! News Facing his own re-election battle in January, polls give Netanyahu little chance of losing but perceptions that he has mishandled Israel's main ally have been seized on by opponents. "I will continue to work with President Obama to ensure the interests that are vital for the security of Israel's citizens," Netanyahu said in a short, congratulatory statement hailing what he called strong strategic relations with Washington. But in remarks underscoring a rift with the United States over possible Israeli military action against Iran, Netanyahu said in an interview broadcast on Israel's Channel 2 this week: "If there is no other way to stop Iran, Israel is ready to act." Relations between Netanyahu and Obama hit a new low two months ago after the Israeli leader said nations which failed to set "red lines" for Iran - which denies seeking atomic arms - did not have the "moral right" to stop Israel from attacking.