Shares of steel and aluminum companies outperformed broader stock benchmarks Tuesday after President Trump said in a social media post that he would boost the planned 25% tariff on Canadian imports of the metals to 50% in the escalating trade war between the countries.

President Donald Trump is openly challenging U.S. allies by increasing tariffs on all steel and aluminum imports to 25% as he vows to take back wealth he says was “stolen” by other countries.