He can pick whomever he wants but there are enough traitor GOPe in the Senate to thwart any real constitutional conservative. Besides I predict if Cruz is the nominee we will lose the Senate.
OTOH, we can leave the choices to The Donald and he will try to make historyby appointing(all leftists though he would not know it) SCOTUS' first "transgender" justice, first practicing abortionist "justice," fist "gay" "married" justice, first ex-convict justice, etc.
Why do we even bother with politics at all, surrounded by ideological surrender monkeys imagining themselves somehow "conservative" on their knees for the US Chamber of Commerce and only for the greedypigs for whom they stand??? On the day that those who ARE conservative unite temporarily with the Sanders crowd in a common temper tantrum, dead or alive, I will celebrate so long as the punishment inflicted on the spineless of BOTH parties is sufficiently spectacularly and memorably severe.