WASHINGTON, March 31 (Reuters) - President Barack Obama's thinking on the crisis facing General Motors Corp (GM.N) has not changed since Monday, a senior administration official told Reuters on Tuesday. "Nothing has changed on this," the official said when asked about a Bloomberg report that the president has determined that a prepackaged bankruptcy is the best way for GM to restructure and become competitive. "This report is not accurate." The White House wants the 60-day period for GM and a 30-day period for Chrysler [CCMLPD.UL] to play out, as announced by the president on Monday, the official said, speaking on condition of anonymity. (Reporting by Jeff Mason; editing by Mohammad Zargham)