I think it's been obvious for at least a couple of years now, that Rubio sold his soul, and became a willing pawn of the power brokers and Washington elites.
His participation in the Gang of 8 is the clearest evidence of that, and there's been much other evidence, since.
Rubio was speaker of house in Florida legislature for 7 years. That means he is a seasoned politician, and well versed in wheeling and dealing.