Notwithstanding
section 1708(c) of this title, the Secretary may terminate the approval of a mortgagee to originate or underwrite single family mortgages if the Secretary determines that the mortgage loans originated or underwritten by the mortgagee present an unacceptable risk to the insurance funds. The determination shall be based on the comparison required under subsection (b) and shall be made in accordance with regulations of the Secretary. The Secretary may rely on existing regulations published before this section takes effect.