Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE’s (R-Wis.) office on Monday highlighted a drop in the stock markets caused by President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE’s decision to levy steep tariffs on steel and aluminum imports.

Ryan's office sent out an email with a CNBC story showing that the Dow Jones industrial average fell more than 100 points at the opening bell Monday over concerns that Trump will implement tariffs of 25 percent on steel and 10 percent on aluminum imports without any exceptions.

After Trump announced the tariffs last week, Ryan was among congressional Republicans who urged the president to consider the unintended consequences of such an action on the U.S. economy.

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With critics raging and markets roiling on the news that Trump would make a formal announcement this week, the president tweeted about the issue on Monday morning.

Trump appeared to focus a threat on Canada and Mexico’s willingness to move forward on the North American Free Trade Agreement — a deal the two countries and the U.S. were negotiating last week in Mexico City.

"Tariffs on Steel and Aluminum will only come off if new & fair NAFTA agreement is signed," Trump tweeted, adding, "Mexico must do much more on stopping drugs from pouring into the U.S. They have not done what needs to be done."