The United States Department of Homeland Security is preparing to impose steep financial penalties on tens of thousands of migrants to recover the costs associated with their arrest, detention, and deportation under a new Trump administration policy that could also complicate future legal reentry into the United States.

Under the proposal, migrants could face fines of roughly $18,000 each.

According to data cited from London-based analytics firm ISI Markets, Mexico’s annual per-capita household income is estimated at roughly $5,000.

Even so, White House officials have argued that the penalties are not solely about revenue collection.