GOP presidential candidates and Republican pundits are eager to accuse the White House of being insufficiently tough with Iran. News that Israel and the U.S. canceled a planned joint military exercise set off speculation that the move reflected a desire of the Obama administration to tamp down friction with Iran. Indeed, the past week has brought a spike in tensions after the assassination of another Iranian nuclear scientist and published reports that agents with Israel’s Mossad spy agency posed as CIA operatives to recruit members of the Jundallah terrorist network to stage attacks against Iran.