Former Mexican President Mexico Vicente Fox talks after an interview at the "Fox Center," an academic facility focused on free enterprise in San Cristobal, Mexico, Wednesday, March 9, 2016. AP/Eduardo Verdugo

Former Mexican President Vicente Fox tore into President-elect Donald Trump after reports that his administration would seek funding from Congress to build a wall along the US-Mexico border.

"Trump may ask whoever he wants, but still neither myself nor Mexico are going to pay for his racist monument. Another promise he can't keep," the former president said on Twitter Thursday night.

Trump during his election campaign insisted Mexico would pay for the wall. He later asserted that the US would pay, and seek reimbursement from Mexico later.

Mexico's current president, Enrique Peña Nieto, has repeatedly declared Mexico would not entertain any requests to foot the bill.

Mr. Fox, who has been a regular critic of Trump, spoke in sharper terms about the border wall in February when he said Mexico was "not going to pay for that f-----g wall.