They need a bigger box:
Candidates standing on boxes is not an uncommon practice. In many debates involving candidates with large differences in height, shorter candidates are supplied boxes to stand on to make the candidates appear closer to the same height.
Julian Castro is standing on a box in an attempt to make him look taller on the #DemocraticDebate stage pic.twitter.com/ZhTWUwncnB
— Washington Examiner (@dcexaminer) September 13, 2019