[Guenevere]

He had me at.....’’I’m going to build a high wall and Mexico will pay for it’

[smoothsailing]

"I would build a great wall, and nobody builds walls better than me. Believe me. And I'll build it very inexpensively. I'll build a great, great wall on our southern border and I will have Mexico pay for that wall. Mark my words," he said.

Source

When he says "Mark my words", he's putting it all on the line. I like that. He's a serious man.