Summary Trump says he has 'cause' to remove Fed governor Cook's lawyer says she will take matter to court Another open board seat could boost Trump's influence over Fed Market reaction to Trump's move on Cook muted WASHINGTON, Aug 26 (Reuters) - Federal Reserve Governor Lisa Cook will file a lawsuit to prevent President Donald Trump from firing her, a lawyer for the embattled central bank official said on Tuesday, kicking off what could be a protracted legal fight over the White House's effort to shape U.S. monetary policy."His attempt to fire her, based solely on a referral letter, lacks...