Trump last month threatened to put tariffs on cars coming from Mexico into the United States if Mexico did not help Washington deal with the immigration and drug situation along the border.
Trump was due to hold a one-on-one meeting with Merkel later on Wednesday and will meet Russian President Vladimir Putin in Helsinki, Finland, on Monday.
Trump's NRA speech also drew anger in France on Saturday, after the US president, using his hand in a gun gesture, acted out how a gunman had killed hostages one by one during an attack in Paris in November 2015.
Trump campaign sues in Michigan to block vote count results from being certified - World - Chinadaily.com.cn
Tremendous progress
Trucks at the Lhasa West Railway Station in Lhasa, Tibet autonomous region, are ready to transport goods across the region. [Wang Keju/China Daily]
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Trump is expected to visit China next month as part of his five-stop tour in Asia that will also take him to Japan, South Korea, Vietnam and the Philippines.
Trump's trade adviser Peter Navarro said Tuesday that tariffs against China will be "ultimately bullish" for American businesses, as the administration tries to bring "structural change".
Trump has sought to persuade all the other P5 countries to join the US and Russia in talks on an arms control accord to replace the 2010 Measures for the Further Reduction and Limitation of Strategic Offensive Arms (the New START Treaty) between the two countries that expires next February.
Trump's visit came one day after announcing a surprise agreement with the European Union to increase its purchases of soybeans as part of package that could potentially allow it to avoid Trump's threatened tariffs on automobiles, if the two sides can agree on across-the-board reductions in tariffs and other trade barriers.