Well, technically Collins said that it was an action that the FHFA could take under the Incidental Powers of HERA.
A different question presented may be better: Can two federal agencies (here the US Treasury and the FHFA) act together to Nationalize two private corporations?
THAT RULING will come back and bite them in the Arse! Indirectly with the (Tyle case) (CBFC case) ( Chevron case) ( FHFA unconstitutional structured ) then Colins opinion will have conflict !!! Then what??????