We're now hearing from President Pena Nieto as well as his press people that Donald Trump didn't tell the truth when he said the two hadn't discussed who'd pay for the wall. Pena Nieto says they did discuss it and he made clear at the outset of their conversations that Mexico would never pay for it.
It's a quite legitimate question why Pena Nieto didn't contradict Trump when Trump made this claim on stage with him. Maybe he's lying. Maybe Trump's lying. But remember, Trump's a pathological liar. Pena Nieto? I have no idea about his reputation for truth telling.
Late Update: Here's the Clinton camp's first go at it. Not bad. But certainly not enough.