The Obama administration may expand efforts to ease the housing crisis by banning all foreclosures on home loans unless they have been screened and rejected by the government’s Home Affordable Modification Program. The proposal, reviewed by lenders last week on a White House conference call, “prohibits referral to foreclosure until borrower is evaluated and found ineligible for HAMP or reasonable contact efforts have failed,” according to a Treasury Department document outlining the plan. “It is one of the many ideas under consideration in the administration’s ongoing housing stabilization efforts,” Treasury spokeswoman Meg Reilly said in an e-mail. “This proposal has not been approved and there are no immediate planned announcements on the issue.” She confirmed the authenticity of the document, which hasn’t been made public.