Mexico's incoming government said no deal has been reached with the U.S. on the treatment of migrants attempting to cross into the U.S. from Mexico, pushing back on reports that such an agreement has been made — even as a busy port of entry was closed Sunday.

Jesus Ramirez, spokesman for Mexican President-elect Andres Manuel Lopez Obrador, commented Sunday via text message, a day after reports that Mexico will allow Washington to use Mexico as, essentially, an ante-room for thousands of Central American asylum seekers.

Earlier, President Donald Trump said Mexico would be "very smart" to stop groups of Central American migrants before they reached the southern U.S. border, and again laid the blame for U.S. immigration problems on Democrats, without offering evidence.