Where would you even deport a US citizen of Hispanic ancestry too? Mexico is a sovereign nation, it doesn't have any responsibility to accept non-citizens who may be Hispanic that a racist US government just wishes to dump on them.
Well one way would be to use neutron bombs to depopulate mexico. Then we could send our "latinos" there. Mexico can take the choice of us sending our mexicans to a populated mexico or a depopulated mexico. If you don't like that idea, how about this. We take a sizeable portion of the South West U.S. and make it a "latino" homeland. In the farther west, this would go up to and include LA. Then, for most of the southern border, if any mexicans wanted to tunnel into the U.S., they would have to dig a very long tunnel.