The Mexicans know they are being used (and I think you will find not only Venezuela, but the fine hand of Castro behind this). They’ve been trying to keep Central Americans out for years, because the last thing Mexico needs is more impoverished or even criminal people. A Guatemalan was shot today when he attacked the Mexican police who were trying to keep him from crossing into Mexico.
And, btw, Honduras’ New conservative government has already offered the Hondurans jobs and relocation within the country, but almost nobody accepted it. So this has nothing to do with reality and is entirely a political attack by the radical left, using these dumb people as their weapon.
This jump starts the immigration issue and allows Trump to militarize the border without Congress getting involved by declaring a National Security emergency.