Inform the Mexican Government that the United States is expecting them to enforce their own laws and if they cannot then the US will apply sterner measures like freezing all reparation payments from the US to Mexican Addresses. The US will not tolerate a border invasion, armed or not!
I believe you mean remittances, money sent from the US to individuals in other countries. I have repeatedly suggested a substantial tax or fee on it to pay for the wall. Those from places other than Mexico, Central and South America can file a form to receive a rebate. Bonus: The form helps us keep track of THEM.
measures like freezing all reparation payments from the US to Mexican Addresses
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Excellent idea.