Congress wanted to guarantee that the $700 billion financial bailout would limit the eye-popping pay of Wall Street executives, so lawmakers included a mechanism for reviewing executive compensation and penalizing firms that break the rules. But at the last minute, the Bush administration insisted on a one-sentence change to the provision. The change stipulated that the penalty would apply only to firms that received bailout funds by selling troubled assets to the government in an auction, which was the way the Treasury Department had said it planned to use the money. Now, however, the small change looks more like a giant loophole, according to lawmakers and legal experts. In a reversal, the Bush administration has not used auctions for any of the $335 billion committed so far from the rescue package, nor does it plan to use them in the future. Lawmakers and legal experts say the change has effectively repealed the only enforcement mechanism in the law dealing with lavish pay for top executives. The flimsy executive-compensation restrictions in the original bill are now all but gone," said Sen. Charles E. Grassley (Iowa), ranking Republican on of the Senate Finance Committee. Senators on the Finance Committee have expressed concern to Paulson and are now considering whether they should amend the law to apply the enforcement mechanism to all firms participating in the bailout.