Mexico's president has lashed out at Moody’s ratings service after it downgraded the Mexican government’s debt outlook to “negative.”

Mexico's outlook was moved to negative from stable by Moody's Ratings on Thursday, as the major credit rating agency pointed to institutional and policy weakening that risks undermining the economy as well as government accounts.

Moody's Ratings has downgraded its Mexico outlook to negative but maintained the country's overall credit rating at Baa2.