The two top-ranking Democrats in the U.S. Senate pressed Obama administration officials Thursday on contentious aspects of the restructuring of General Motors Corp. (GMGMQ), including issues facing auto dealers.

Senate Majority Leader Harry Reid, D-Nev., and Majority Whip Richard Durbin, D-Ill., sent a letter to Obama auto adviser Steven Rattner expressing "concerns regarding the treatment of certain stakeholders in the restructuring process." The senators asked for "clarification" on issues facing dealers, GM workers and consumers.

The senators ask whether the proposed reorganization for GM will "indemnify" the company's dealers from potential liability claims and legal fees associated with claims based on variations in state laws.

The senators point out that GM plans to open dealerships in territories previously served by dealers that have been told to close. They ask how the auto task force will help rejected dealers reopen dealerships in those areas.

The senators ask about the process for resolving pending and future worker compensation claims against GM before and after restructuring.

They ask about the process for recovery for those who have been injured by defective GM products and who have pending claims against GM.

They inquire how the Treasury Department's auto task force will ensure GM satisfies pension and healthcare obligations for current and future retirees.

"Why under the restructuring agreement are the claims of certain union members being treated differently than the workers and retirees of other unions?" they ask.

A Treasury Department spokeswoman declined to comment.

-By Josh Mitchell, Dow Jones Newswires; 202-862-6637; joshua.mitchell@dowjones.com