The issue came to a head when Geithner called Liddy and told him the payments were unacceptable and had to be renegotiated, said an administration official who was not authorized to comment on the Geithner conversation.

In a letter to Geithner yesterday, Liddy agreed to restructure some of the payments. But Liddy said he had “grave concerns” about the impact on the firm’s ability to retain talented staff “if employees believe that their compensation is subject to continued and arbitrary adjustment by the U.S. Treasury.”

Lawyers at both the Treasury Department and AIG have concluded that the firm would risk a lawsuit if it scrapped the retention payments at the AIG Financial Products subsidiary, whose troublesome derivative trading nearly sank AIG.