Peter Landesman did a little fan Q&A event on Reddit in which he also talk about Tom Welling.

Question: Tom Welling fans are very excited to see him return to acting, especially in such a prestigious project. How did you come to cast him in the film?
Peter Landesman: Tom was a total stud and a great actor. I wanted someone who was physically strong, and felt like someone who could do physical damage as a bodyguard, and I loved the idea of taking him from television to feature films. Standing next to him in a crowd is a very dangerous thing, girls attack him.