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 lashes out at tell-all author in tweet

President Trump is continuing to denounce an unflattering new book on his presidency, as well as media outlets that have reported on its contents.

Michael Wolff’s “Fire and the Fury: Inside the Trump White House,” portrays the 45th president as surrounded by aides who believe he’s unfit for the office he holds. The White House has called it “complete fantasy.”

In a tweet Saturday afternoon, Trump called Wolff  “a mentally deranged author, who knowingly writes false information.”

The book has prompted questions about Trump’s own mental fitness.

Trump has pushed back, tweeting that he's “a very stable genius.”

And earlier in the week, he said he's going to be taking “a strong look at our country's libel laws,” blasting the current standards as “a sham and a disgrace.”

On Friday, Trump received his first medical checkup at Walter Reed military hospital, and a White House physician declared him in “excellent health.”

— This post contains reporting from the Associated Press and Times staff writer Alex Wigglesworth.

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