The National Republican Congressional Committee has found internal problems serious enough to merit an FBI investigation.

“As part of our ongoing efforts to institute and strengthen financial controls at the National Republican Congressional Committee, we learned earlier this week of irregularities in our financial audit process,” Chairman Tom Cole, R-Okla., said Friday in a written release.

“Since these irregularities may include fraud, we have notified the appropriate law enforcement authorities. We are aggressively and thoroughly investigating the matter and, while we determine the details, we have terminated our relationship with a former employee who was engaged as an outside vendor.”

The NRCC is the fundraising arm of the House Republican caucus.

A GOP aide said Cole’s office notified the FBI, but would not provide additional details.