Except for the authority of the Director of the Office of Federal Housing Enterprise Oversight described in section 4513(b) of this title and all other matters relating to the safety and soundness of the enterprises, the Secretary of Housing and Urban Development shall have general regulatory power over each enterprise and shall make such rules and regulations as shall be necessary and proper to ensure that this part and the purposes of the Federal National Mortgage Association Charter Act (12 U.S.C. 1716 et seq.) and the Federal Home Loan Mortgage Corporation Act (12 U.S.C. 1451 et seq.) are accomplished