Invaders fly into Mexico City from many nations. For some, this is as simple as getting a visa at home. For some, they don't even need a visa. Mexico knows who and what they are up to. That they are just passing through, on their way to the US-Mexican border.
So Mexico does not mind this at all!
This morning I saw a video of what looked like a group of Indians border jumping. Couple had turbans on as they squeezed through the fence.