Cruz hasn’t copied Trump. Trump copied Cruz and it’s easy to prove. On March 23rd, Cruz gave his announcement speech and outlined his policy positions. Months later, Trump announced and gave the same positions except he left out Religious Liberty and abolishing the IRS.
Cruz was for a border fence, not a wall. Does not matter anyway. Cruz worked in the Bush admin and so did his wife who advocated for open borders and the North American Union. They are not for the same as Trump.