US President Donald Trump’s tariffs on aluminum and steel are motivated mostly by concerns that China is flooding the global market and harming US manufacturing, said a former trade adviser to the White House.

“Any steel coming into the United States is going to have a 25% tariff,” he told reporters Sunday on Air Force One as he flew from Florida to New Orleans to attend the Super Bowl. When asked about aluminum, he responded, “aluminum, too” will be subject to the trade penalties.

President Trump on Monday impose 25% tariffs on all steel and aluminum imports into the United States. "This is a big deal, the beginning of making America rich again," Mr. Trump said as he signed the tariff orders in the Oval Office. All foreign steel and aluminum imports, regardless of the country of origin, will be subject to the tariffs.

President Donald Trump on Monday imposed 25% tariffs on all steel and aluminum imports to the United States. “This is a big deal," Trump said while signing the proclamations in the Oval Office. "The beginning of making America rich again."

The Trump administration told Mexican officials that they should put their own duties on Chinese imports as part of their efforts to avoid tariffs threatened by President Donald Trump, according to people familiar with the matter.

In a drab office in China's industrial heartland, Andy Xiao frets over the future of his shoe materials business, now straining under sweeping tariffs imposed by Donald Trump.