This is AP’s purported “Trump transcript”:
“You have a bunch of bad hombres down there,” Trump told Pena Nieto, according to the excerpt given to AP. “You aren’t doing enough to stop them. I think your military is scared. Our military isn’t, so I just might send them down to take care of it.”
https://apnews.com/0b3f5db59b2e4aa78cdbbf008f27fb49
Perhaps the offer was more of a, if you can’t clean up your dirt, I know someone who can.