WASHINGTON (AP) — A congressional review panel said there is “substantial reason to believe” that veteran Rep. Tom Petri of Wisconsin violated House rules by acting on behalf of two companies in which he owned significant amounts of stock, according to a report released Tuesday.

The independent Office of Congressional Ethics said Petri advocated for Oshkosh Corp. and the Manitowoc Co. despite owning at least $250,000 worth of Oshkosh stock and at least $100,000 worth of stock in Manitowoc. Both companies are based in Wisconsin.