As of 2008, Fannie Mae and Freddie Mac owned or guaranteed about half of the U.S.'s $12 trillion mortgage market. This made both corporations highly susceptible to the subprime mortgage crisis of that year. Ultimately, in July 2008, the speculation was made reality, when the US government took action to prevent the collapse of both corporations. The US Treasury Department and the Federal Reserve took several steps to bolster confidence in the corporations, including extending credit limits, granting both corporations access to Federal Reserve low-interest loans (at similar rates as commercial banks), and potentially allowing the Treasury Department to own stock. This event also renewed calls for stronger regulation of GSEs by the government.