A national infrastructure bank could complement an extended Build America Bonds program, but no detailed proposal for the bank is ready to be unveiled soon by the Obama administration, officials told the Senate Banking Committee ­Tuesday.

Build America Bonds, the popular direct-pay, taxable municipal bond created by the American Recovery and Reinvestment Act, could be “a useful tool” in conjunction with a national infrastructure bank, or NIB, that would attract private-sector investment, said Alan Krueger, the Treasury’s assistant secretary for economic policy. He reiterated the administration’s desire to see the BAB program made permanent at a 28% federal subsidy rate.

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