In a sudden escalation of a long simmering feud, Relevent Sports filed a lawsuit against the United States Soccer Federation in New York State Court on Monday, claiming U.S. Soccer is jeopardizing Relevent’s soccer promotion business and has a conflict of interest in sanctioning professional matches.

The lawsuit adds to the legal woes for U.S. Soccer, which is facing at least three other lawsuits, including a gender discrimination claim filed by members of the United States women’s national team last month.

Relevent Sports is a promoter that brings high-profile European clubs to the United States each summer to play exhibition matches in football stadiums during its International Champions Cup tournament. This year’s edition will feature teams like Real Madrid, Bayern Munich and Arsenal, but Monday’s lawsuit makes clear that the company has ambitions outside its usual summer window, ambitions that most likely made a conflict with U.S. Soccer inevitable.