Washington (AFP) - The United States pledged its unwavering committment to Israel on Monday, and insisted it will take "whatever steps are necessary" to deny adversary Iran a nuclear bomb. As international negotiators seek a deal with Tehran to rein in its nuclear program, Washington's UN ambassador Samantha Power reiterated President Barack Obama's commitment to prevent the Islamic republic from developing atomic weapons. "He will keep his commitment whether the negotiations collapse or produce a diplomatic solution that meets our bottom line," she told some 16,000 attendees at US pro-Israel lobby AIPAC ahead of a speech by visiting Israeli Prime...