Tesla Inc. Chief Executive Elon Musk took to Twitter Thursday to call on President Donald Trump to promote what he called “a fair outcome” on import duties just hours ahead of the administration’s final say on potential steel and aluminum tariffs.

The Tesla TSLA, +1.63% top executive also signaled some discontent with import duties on American-made cars in China and Chinese-made cars coming to the U.S., and professed himself as being against import duties in general. He was tweeting directly to the president, an unusual step.