Freddie Mac ( FRE) said Wednesday it has tapped its government credit line for another $6.1 billion. In a filing with the Securities and Exchange Commission, the mortgage financing giant said the Treasury Department provided the additional funds on June 30. Freddie reported a $6.01 billion shortfall in assets vs. liabilities when announcing first-quarter results. Its capital request was rounded up to the nearest $100 million, bringing Freddie's debt to the federal government up to $51.7 billion. It still has$149.3 billion worth of credit to draw from. That does not include $1 billion worth of preferred stock that Freddie issued to the Treasury as part of its initial aid package when the firm and its counterpart Fannie Mae ( FNM) were placed into government receivership last fall.