You know where this one is going:
http://rules-republicans.house.gov/Educational/Read.aspx?ID=5References to the Senate or Executive Branch
Until the 109th Congress, it was not in order to make certain references to the Senate or individual senators. However, at the beginning of that Congress, the House removed the prohibition on making references to the Senate, leaving only the requirement that debate be confined to the question under debate and avoid “personality.” The precedents of the House allow a wide latitude in criticism of the President, other executive officials, and the government itself. However, it is not permissible to use language that is personally offensive to the President, such as referring to him as a “hypocrite” or a “liar.” Similarly, it is not in order to refer to the President as “intellectually dishonest” or an action taken by the President as “cowardly.” References to the Vice President, in spite of his role as President of the Senate, are measured against the standard used for the President rather than prior standards used to govern the Senate.