Trump says that's because he wants to get it started fast.
"On the fence: It's not a fence, it's a wall", Trump said in response to a question at his first press conference since winning the White House. "I don't want wait a year and half to make a deal with Mexico". He said Mexico would reimburse the cost either through a tax or a payment.
The Mexican peso took hit when Trump won in the U.S. presidential elections in November. "(Vice President-elect) Mike Pence is leading an effort to get final approvals through various agencies and through Congress for the wall to begin", Trump explained.
While campaigning for the presidency, Trump promised to have a wall built along the border and have Mexico pay for it. In a tweet last week, Trump went after Toyota for a proposed expansion in Mexico and criticized General Motors for making a version of the Chevrolet Cruze in Mexico, a small number of which are sold in the U.S. GM CEO Mary Barra has touted the company's U.S. investments, while plans - announced years ago - to invest some $5 billion in new plants in Mexico appear unchanged by Trump.
He renewed his pledge to bring American jobs, investment and manufacturing back to the USA, and to impose higher border taxes on firms that choose to carry their operations to Mexico and elsewhere.
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That incident ended two hours later when all seven attackers, including a suicide auto bomber, were gunned down by Afghan forces. Dozens of people have been killed in Afghanistan in one of the worst outbreaks of violence in recent weeks.
He asks, "What's the difference? We probably will have a deal sooner than that", he said as he praised the Mexican government.
"It's foreseeable, I'd say nearly inevitable that it keeps on depreciating", OECD Secretary General Jose Angel Gurria said in Mexico City.
"Mexico has taken advantage of the United States".
Speaking on Mexican television last week, the country's current foreign minister, Luis Videgaray, said there is "no way" his country will foot the bill for the wall.
The Republican real estate billionaire, who assumes office on January 20, has threatened to fund the giant wall by tapping into the billions of dollars in remittances that Mexican migrants in the United States send back home. "What is inadmissible, and which would deeply violate the dignity of all Mexicans, is to expect Mexico to pay for infrastructure of the United States", Videgaray told Radio Formula.