In a rare news conference by the generally media-shy mogul, Slim said Mexico needed to negotiate from a position of strength, noting that Trump, who he called a "great negotiator," represented a major change in how politics is conducted.

Here are a couple of the key comments so far:

SLIM SAYS HE'S PLEASED TO SEE HOW MEXICO HAS UNITED

MEXICANS COMING TOGETHER IN SUPPORT SURPRISED ME, SLIM SAYS

THIS IS AN ARDUOUS, DIFFICULT NEGOTIATION W/U.S.

SLIM SAYS BORDER TARIFFS WOULD BE PAID BY U.S. CONSUMERS

TRUMP HAS MORE STRENGTH DUE TO STRENGTH OF U.S. ECONOMY

MEXICO SHOULD TURN TOWARD DEVELOPING DOMESTIC ECONOMY

I DON'T AGREE W/MEXICAN BOYCOTT OF U.S. GOODS

PESO EXCHANGE RATE ARTIFICIAL, INFLUENCED BY PEOPLE LIKE TRUMP'S TWEETING

MEXICO'S SLIM SAYS TRUMP IS NOT THE TERMINATOR, HE IS A NEGOTIATOR

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Just over a month ago, President-elect Trump and Mexico's richest man, Carlos Slim, enjoyed what was described by Trump as "a lovely dinner with a wonderful man" at Mar-a-Lago in Palm Beach, Florida.