The national banks, responsible for the remaining quarter of the current subprime loans, were put under a different kind of pressure by the Clinton team. Changes were made to the Community Reinvestment Act to establish a system by which banks were rated according to how much lending they did in low-income neighbourhoods. A good CRA rating was necessary to get regulators to sign off on mergers, expansions, even new branch openings. At the same time, the government pressed Freddie Mac and Fannie Mae, the two giants of the secondary mortgage market, to help expand mortgage loans among low and moderate earners, and introduced new rules allowing the organisations to get involved in the securitisation of subprime loans.