A congressional review panel says there is "substantial reason to believe" Democratic Rep. Alan Grayson of Florida acted improperly in a number of business activities and in managing his congressional office.
Grayson, who is running for the Senate, remains under scrutiny by the House Ethics Committee over allegations that he broke House rules through improper business activities and use of official congressional staff for unofficial purposes.
The House ethics panel announced Tuesday that it is extending an investigation into the allegations.
Grayson has denied wrongdoing.
The ethics committee's Republican chairman and senior Democrat said in a joint statement that the panel is reviewing a referral from the independent Office of Congressional Ethics, an outside panel that reviews ethics complaints against House members.