特朗普在信中提及抵押贷款相关指控，并称认为有充分理由解雇美联储理事Cook职务。

Core Viewpoint - Trump mentioned allegations related to mortgage loans and expressed sufficient reasons to dismiss Federal Reserve Governor Cook from his position [1] Group 1 - Trump referred to mortgage-related allegations in his letter [1] - Trump believes there are adequate grounds to terminate the position of Federal Reserve Governor Cook [1]