Mexico's Economy Minister Ildefonso Guajardo in a tweet said the threat is "the wrong way to incentivise the creation of a new & modern NAFTA".
But the Trump administration is coming under political pressure at home to exclude Canada, which is the largest source of imported steel and aluminum to the United States.
Beijing's concerns are that this is only the first step in Washington, and other areas will soon be addressed, such as an investigation into China's efforts to get the USA intellectual property as announced by the White House administration in the past year.
Trump's aversion to German vehicle imports had manifested before.
Donald Trump last week fired the first round of shots in a potential trade war when his tweet blamed the country's trading partners for its $800 billion annual trade deficit.
In a tweet on Sunday, he argued: "We are on the losing side of nearly all trade deals".
US Speaker of the House Paul Ryan said he was "extremely worried" about the impact of a trade war, adding that it could undermine economic gains. Everybody! China, Russia and take people that we think are wonderful: "the European Union".
Officials within Alberta's steel industry are feeling uneasy about comments by U.S. President Donald Trump.
Hearthstone: The Witchwood adds Monster Hunt mode
The Witchwood card reveal livestream will begin at 11:00 am PDT on March 26 on the official Hearthstone Twitch.tv channel . Worgen cards will swap their attack and health for each turn they stay in your hand.
Mourinho backs Klopp and officials over touchline antics
Those games will be Southgate's last chance to experiment before naming his 23-man squad for the World Cup in Russian Federation . Marcus Rashford (left) and Romelu Lukaku celebrate Manchester United's second goal in their 2-1 win over Liverpool on Saturday.
Trump backs off Mexico, Canada tariffs - for now
He also highlighted the strength of the national security relationship between the United Kingdom and the US. Later this week, Trudeau is due to visit the Ontario steel city of Hamilton, where workers are on edge.