The diplomatic dustup comes amid threats from President-elect Donald Trump to impose tariffs, deploy U.S. troops to go after cartels and conduct mass deportations.

The U.S. ambassador to Mexico, Ken Salazar, said on Wednesday that the country is not safe and criticized the previous president for a failed security policy and refusing to accept American assistance.

U.S. Ambassador Ken Salazar lashed out Wednesday at Mexico’s failure to accept aid in the fight against drug cartels, claiming the country “closed the doors” on security cooperation. In, Salazar launched his harshest criticism yet of rampant violence,

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

Moody's linked Mexico's credit outlook downgrade to the nation's government debt and the constitutional overhaul of its judiciary system.

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.