Could also involve wire fraud, US govt fraud and money laundering if it involves:
<><> cashing US govt checks using multiple identities.
<><> cashing EITC checks claiming children they do not have.
<><> falsifying US documents to collect unemployment, Workmen/s Comp, SSI, Social Security, etc.
Mexico is prolly collecting billions in fees from the US-documented 144 countries gathering at their borders to slither into the US.
LOL - there are sooooooo many ways to make them pay for the Wall...