In years past but hopefully no longer though that remains to be seen, the RATS had all the say even when they were the minority. Go back to when Republicans took over the Senate in 1980 and then both houses in 1994 and you'll see where they deferred to the Democrats at every turn including continuing to call many of the former committee heads, "Mr. Chairman." Being in the minority meant nothing when the likes of Ted Kennedy, Patrick Leahy, or Joe Biden would interrupt a hearing and thereafter the cowering Republicans would look to them for direction in what to do next.
Again, I hope this is in the past, but I'm going to need to see some serious smackdowns before I believe it. Trump and his guys are definitely in charge and tell the RATS and their allies to eff off as many times a day as needed (which is becoming fewer and fewer already), but Ryan, McConnell, and the rest of the GOPe are guilty until proved otherwise.