President Donald Trump spoke with reporters on Air Force One, where he defended tariffs, saying they will be the "greatest thing we've ever done as a country."

The Chinese government announced the tariffs last week, shortly after President Trump raised tariffs on Chinese products for the second time since he took office in January. The Chinese tariffs will include a levy of 15 percent on U.S. products like chicken, wheat and corn, as well as 10 percent on products like soybeans, pork, beef and fruit.