Former US defense secretary Robert Gates lashed out Prime Minister Binyamin Netanyahu, calling him an ungrateful ally and blaming him for diplomatically isolating Israel and hurting American interests, according to a Tuesday column. The criticism, which was revealed in a Bloomberg column by Jeffrey Goldberg, apparently peaked after Netanyahu met with US President Barack Obama last March, lecturing him on the Israeli security situation with a level of "impudence" that shocked many in the White House, including Secretary of State Hilary Clinton. Gates felt that while the US had laid out "many steps" to "guarantee Israel's