It’s probably fair to say that on day 1 of a Cruz presidency, he would have both the Republican & Democratic party working to undermine him.
Orrin and Lindsey and John would suddenly find they actually CAN vote against a cabinet or judicial nomination
That seems to indicate cruz is not the problem. Those working to undermine him are. And to be fair and consistant they will do the same to anyone including trump who tries to do things they dont agree with.
Just like Reagan did.