Leicester Tigers have had to cancel a historic pre-season friendly in America because the US governing body have refused to sanction the match.
Tigers had agreed to play the first elite rugby match in the US in Philadelphia in August to help launch a professional league.
But USA Rugby have not given official approval despite tickets for the game having already been sold.
Tigers chief executive Simon Cohen said the situation was "very disappointing".
He added: "Our experience in this case could lead you to question whether USA Rugby is more keen to protect its own commercial interests than to serve and promote the game of rugby as a whole in their country.
"Rugby is a rapidly growing game in the USA and the appearance of the Leicester Tigers would certainly have helped to create a buzz around the sport, together with NRFL's proposals for a professional game there."