But the official indicated that the administration was inclined to do more than just keep G.M. and Chrysler alive until President-elect Barack Obama takes office, saying, “Giving them enough money to limp along doesn’t solve anything.”

In the negotiations, the Treasury secretary, Henry M. Paulson Jr., is effectively taking on the role of “auto czar,” which was envisioned in the carmakers rescue bill written by the White House and Congressional Democrats and approved by the House but blocked by Senate Republicans.