I had a feeling things like this would happen as soon as I saw this photo, taken shortly after the election:
Look at McConnell's expression, especially his eyes (the gateway to the soul). Mitch looks a bit terrified. Also notice: Trump is looking directly at the camera (presumably there were multiple cameras going off at that angle). What's Mitch looking at? The wall.
OK, one could posit that the Senate Majority Leader is being deferential to the President-Elect; however, body language is also telling. Trump: shoulders forward, stride confident, head forward. Mitch: Shoulders a bit slumped, stride attenuated, head held back. It's clear from that photo that Trump is leading, Mitch is following.