A top Senate Republican on Thursday accused the Obama administration of misleading taxpayers about General Motors' loan repayment, saying the struggling auto giant was only able to repay its bailout money by dipping into a separate pot of bailout money. Sen. Chuck Grassley's charge was backed up by the inspector general for the bailout — also known as the Trouble Asset Relief Program, or TARP. Watchdog Neil Barofsky told Fox News, as well as the Senate Finance Committee, that General Motors used bailout money to pay back the federal government. "It appears to be nothing more than an elaborate TARP money shuffle," Grassley, the ranking Republican on the Senate Finance Committee, said in a letter Thursday to Treasury Secretary Timothy Geithner. GM announced Wednesday that it had paid back the $8.1 billion in loans it received from the U.S. and Canadian governments. Of that, $6.7 billion went to the U.S. treasury.