I'd like to see him try. It's not as easy as he thinks.
"There’s not a lot of detail to Trump’s suggestions, making them hard to fully evaluate, but trade experts from across the political spectrum warn that most of his threatened tariffs would violate decades of binding trade deals negotiated by previous administrations and agreed to by previous Congresses.
“That 20% tax would be an absolutely straightforward violation of probably every trade law the United States has with any other country,” Joshua Meltzer, a fellow in global economy and development at the Brookings Institution, told msnbc.
“All of our existing agreements lock us into lower tariffs,” Claude Barfield, a scholar at the American Enterprise Institute who supports lowered trade barriers, told msnbc.
“Absolutely illegal,” Robert E. Scott, director of trade and manufacturing research at the Economic Policy Institute and a strong critic of past trade agreements like NAFTA, told msnbc when asked about Trump’s 20% import tax.
Current tariff rates, which vary from product to product, are far lower than Trump’s various proposals – the average U.S. tariff on imports from World Trade Organization members
was 3.4% in 2013 and even lower when weighted to reflect which goods were imported. Assuming Trump succeeded in getting his plans past Congress, countries would be free to challenge the tariffs as a trade violation, and experts believed an international arbiter would almost certainly take their side. If Trump refused to back down, world leaders would then be free to raise their own tariffs in retaliation, setting the stage for a trade war that could strain foreign relations and depress American exports."
http://www.msnbc.com/msnbc/donald-trump-wants-tax-the-world-even-legal