Two senior White House aides knew weeks ago that a probe of the Internal Revenue Service had found that the U.S. tax agency had inappropriately targeted conservative groups, but did not tell President Barack Obama, a White House spokesman said on Monday. A Treasury Department official informed White House counsel Kathryn Ruemmler on April 24 about the preliminary findings of a report that would fuel the latest in a series of scandals to confront Obama at the start of his second term. The report was issued by a Treasury inspector general on May 14, four days after an IRS official...