"Free, fair, and honest elections unmarred by fraud, errors, or suspicion are fundamental to maintaining our constitutional Republic," the order says.

Mexican Foreign Minister Juan Ramon de la Fuente spoke with the U.S. Deputy Secretary of State Christopher Landau on Wednesday in a call focused on strengthening bilateral relations, Mexico's foreign ministry said.

Administration officials cited cracking down on immigrants illegally on voter rolls as one of the executive order’s main goals, amplifying Mr. Trump’s grievances about electoral integrity.