The Price Of The Pope

Does someone now own the Pope? Why would the Pope who lives surrounded by a tall security wall bash someone else, Donald Trump, for wanting to build a wall to help keep our country safe. The Pope claims it was not Christian to build a wall, yet The Vatican is surrounded by one. Why would the pope pick specifically on Donald Trump when he is only protecting America and not purposely harming ANYONE. Why not call out ISIS or someone else actively causing harm? This sounds like a statement from someone who is under the thumb of someone else. This behavior is below someone with the stature of the Pope.