WASHINGTON - Treasury Secretary Tim Geithner yesterday said he is looking at options, including the possibility of a liquidity backstop for variable-rate debt, to "reinforce" some improvement that has occurred in the municipal market.

Speaking to reporters yesterday about the details of Treasury's Public-Private Investment Program, Geithner acknowledged receiving the letter sent Friday by House Financial Services chairman Barney Frank, D-Mass., and 25 other House members requesting a temporary liquidity backstop for variable-rate debt.

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