$18,000,000,000.
Feed the poor, help the sick, teach the young,
There are more important ways to spend that money.
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You think that Mexico is our enemy? Ha ha ha ha.
If there is war, Mexico will be helping the US, and the US would be sending supplies of food, arms, and medicine, in huge amounts.
Why don't we invite them to join the US? And Central America? Etc?
That would end the immigration problem.