You honestly believe that? Then why isn't Trump out there defending Cruz who say he isn't eligible instead of agreeing with them that he isn't eligible? What Trump has done is make it impossible for him to even consider Cruz, assuming he ever had to begin with. And has made it impossible for Cruz to accept the VP spot, assuming he ever would have accepted it to begin with.
Trump is doing what the left-wing nut Soros people would do. That way, He is FULLY VETTED, not just endorsed by Trump.