(as usual, we have to spend effort to figure out what Rs are talking about)

Something about people bringing cattle up to Mexico from Central and South America (presumably on their way to US) and these animals are infected with screwworm, which then infected Mexican herds, and so the US had to stop importing Mexican cattle.

I didnt listen to what he actually said, so there might be more blatant stupidity involved.

The mental gymnastics these folks go thru to come up with this stuff is just astonishing.

and blaming this on the migrants' herding of their cattle onto American shores as they fled northwards into America.

Just how stupid and dumb can these people be? Just when I thought that they were already at the bottom, they go lower...

God almighty...