Bolden very clearly stated that he's upset that there's money for all these Russian ISS launches, but not for his SLS and the CCV programs. There is no bigger cheerleader for CCV than Bolden. This SLS vs CCV "controversy" is 100% manufactured.
It costs around $81 million to send just one astronaut on the Soyuz. Bolden says it will only cost $58 million per seat to send astronauts on the Commercial Crew vehicles. "It’s as if we keep ordering expensive takeout because we haven’t yet set up our own kitchen — only, in this case, the takeout meals are costing us hundreds of millions of dollars," he writes.
Congress keeps insisting that NASA spend more on the SLS than it wants to, and less on the CCV. Even if we were to fully fund CCV this year it wouldn't be until 2018 or so that we could stop hitching rides with the Russians so I don't think it's fair to say that the CCV and Russian ISS launches are in conflict right now.
http://www.theverge.com/2015/8/28/9221541/NASA-Charles-Bolde...
It costs around $81 million to send just one astronaut on the Soyuz. Bolden says it will only cost $58 million per seat to send astronauts on the Commercial Crew vehicles. "It’s as if we keep ordering expensive takeout because we haven’t yet set up our own kitchen — only, in this case, the takeout meals are costing us hundreds of millions of dollars," he writes.