Trump asked Nieto how he wanted it to go when he became President - hard, or easy. Nieto chose easy. Trump gave the world an example of how easy things can be when you don’t screw with him. The world - the entire world - took notice.
This was a Trump masterstroke.
Yup. Trump’s remarks were very plain and firm. He was inclusive however about the US and Mexico partnering on these issues for the benefit of both countries.