His tweets have the power to shape international relations, send stock prices up — or down — and galvanize the American public.

We're watching how Donald Trump is using this platform of unfettered communication now that he’s commander in chief. Here is everything Trump has tweeted since he was sworn in as 45th president of the United States. In many cases, we look at what he was reacting to and whether what he said was accurate. And, as much as possible, we'll relate what else was going on at the time. Check back for more as Trump continues to tweet.

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Trump on his steel inquiry: 'We are going to come in first in all deals'

President Trump shared Fox News footage of his remarks while signing a memorandum expediting an investigation into whether steel imports are jeopardizing national security.

Trump promised as a candidate to revitalize the American steel industry, the decline of which has been especially hard on states like Pennsylvania that were crucial to his victory.

The president said maintaining steel production was crucial to United States security interests because it was needed to build airplanes, ships and other machinery, along with roads, bridges and other infrastructure.

The American steel industry argues that if the U.S. is dependent on imported steel, it could be vulnerable if relations break down with nations that export it.

U.S. prominence in the industry has been slipping for decades. American-made steel once accounted for about 20% of global production, but had slipped to less than 5% by 2015, according to the Belgium-based World Steel Assn. 

Trump couched the investigation as part of action he took earlier in the week to enforce existing "Buy American" laws.

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