WASHINGTON -- Congressional investigators are trying to find out if primary dealers on Wall Street colluded to protest the new Treasury bidding rules by shunning last week's three-year note auction.

The House Energy and Commerce Subcommittee on Telecommunications and Finance, chaired by Rep. Edward Markey, D-Mass., has sent letters to all 39 dealers asking them to detail their bidding strategy and related activities in connection with the sale. Responses to the panel are due today.

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