Four U.S. Senators wrote to President Bush today urging him not to retaliate against Richard S. Foster, a government official and Medicare specialist who recently claimed that a senior administration official told him to withhold information from Congress. The Senators cited White House attacks against former U.S. Treasury Secretary Paul O'Neill and former Ambassador Joseph Wilson, in charging that "the administration has shown its willingness to engage in unfair and untoward retaliation when it is confronted with criticism." The letter, signed by Senators Jon Corzine, Frank Lautenberg, Ted Kennedy, and Chuck Schumer, asks that Foster "be treated with the respect that he has earned and given an opportunity to air his grievances without being demonized in the public eye." Foster, Medicare's chief actuary, said last week that he was prohibited from telling Congress that the Medicare prescription drug bill would cost $140 billion more over then years than was publicly projected. The full text of the letter on Schumer's website here.