The two leaders also condemned the regime of Venezuelan President Nicolás Maduro.
The Mexican president unveiled a program of around US$320mn to provide interest-free loans to micro enterprises.
The two-notch downgrade comes on the heels of similar ratings revisions by Moody's and S&P last month, as concerns deepen around political gridlock and the need for external borrowing in a high-rate environment.
A roundup of banking news from Chile.
The new government of President Jair Bolsonaro has unveiled a series of changes for Caixa and other government-controlled firms.
During his hearing for nomination to the central bank board, Jonathan Heath said the current crackdown on fuel thieves could have a negative impact on economic growth and inflation if shortages are not resolved in the short term.
Panama's chamber of commerce urges candidates to put forward their proposals.