Rep. Darrell Issa, R-Calif., slammed the Justice Department after a report late Monday that no charges would be forthcoming in its probe of the Internal Revenue Service's targeting of conservative Tea Party groups.

In a statement emailed to reporters, Issa, chairman of the Oversight and Government Reform Committee, said:

Anonymous — and apparently politically motivated — leaks from unnamed law enforcement officials further undermine the public assurances by the current and former FBI directors that this is a legitimate investigation. These leaks come after the Justice Department, citing the confidential nature of the investigation, refused to brief Congress on its progress and congressional investigators independently discovered that a high dollar contributor to the Obama administration failed to recuse herself. These revelations further undermine the credibility of the Attorney General [Eric] Holder and the Justice Department under his leadership. Given the circumstances, there is little reason for the American people to have confidence in this investigation.

Issa was reacting to a Wall Street Journal report that the FBI would not be making any charges.

Last week, Issa criticized Holder for placing Justice Department attorney Barbara Bosserman, a donor to President Obama, in charge of the IRS/Tea Party investigation.