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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Upon return to White House, Trump tweets about storm recovery, the economy – and Hillary Clinton

President Trump returned Saturday night to the White House after visiting Texas and Louisiana to meet with victims of Hurricane Harvey.

His Twitter finger appeared to be itchy.

In the first of three tweets sent minutes apart, the president touted a rise in the Institute for Supply Management's manufacturing index, which measures how quickly U.S. factories are expanding.

The index now stands at its highest level since April 2011, pointing to solid economic growth.

Trump then provided an update on rescue and recovery efforts in areas hit by Harvey, which slammed into the Gulf Coast on Aug. 25 as a Category 4 storm and delivered days of drenching rain.

Echoing the tone he took while touring flood-ravaged areas earlier Saturday, Trump remained decidedly upbeat and praised the "cooperation & coordination" of authorities, relief workers and volunteers.

The president concluded the string of tweets by issuing a reminder that he had signed a proclamation establishing Sunday as a day of prayer for those dealing with Harvey's aftermath.

Also on Saturday night, the president retweeted two messages from a conservative blog highlighting his trip to Texas.

Trump retweeted a third message that mocked Democratic presidential candidate Hillary Clinton with a doctored photo of her upcoming memoir, "What Happened."

Several hours later, Trump tweeted a video montage featuring highlights of his stop in Louisiana and thanked law enforcement officials and volunteer rescuers who helped save residents there.

The last tweet, sent at 1:17 a.m. Eastern time Sunday, came about an hour and a half after North Korea conducted what appeared to be its sixth underground nuclear test, according to South Korean military officials.

Trump did not immediately address the development on Twitter.

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