Trump has two account. One is the official POTUS account. That is his government account.
His other is his personal account @realdonaldtrump. That’s the one he uses to communicate with us and troll them.
Trumps tweets are official statements from the president according to the DOJ
“The Department of Justice on Monday told a federal district court judge In Washington, D.C. that Donald Trump’s tweets are “official statements of the President of the United States.”