A senior U.S. Treasury official on Friday rejected calls to recapitalize class="mandelbrot_refrag"> Fannie Mae and class="mandelbrot_refrag"> Freddie Mac , saying it would take at least 20 years to make sure they were adequately funded and that in the meantime taxpayers would be on the hook. In remarks to a housing conference, Treasury Undersecretary Mary Miller repeated the Obama administration's call that the two so-called government-sponsored enterprises be wound down. "Critics of reform would suggest that we can simply recapitalize the GSEs and avoid difficult decisions around creating a new system," she said. "Even if truly rehabilitating the GSEs were possible, recapitalizing them adequately would take at least 20 years." true "During these 20 years, the taxpayer would remain at risk of having to bail out the GSEs during another downturn," Miller added class="mandelbrot_refrag"> Fannie Mae