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If SpaceX's lobbying campaign had succeeded, Musk's company would have ended up with a monopoly on pretty much any military payload it was capable of lifting into orbit.  However, the campaign failed – on June 13 the Senate approved an amendment to the authorization bill that would allow use of up to 18 more RD-180 engines through the end of 2022.  Since the House had already voted a bill that would allow further use of the Russian engines, it appears the great engine debate is over, and ULA won.

https://www.forbes.com/sites/lorenthompson/2016/07/07/why-spacex-lost-its-bid-to-ban-russian-rocket-engine-debate/#20877e105f52