The inaccuracies have been big and small: Trump repeatedly claimed in 2018 that he passed the biggest tax cut in history (he didn’t), that the U.S. economy is the best in history (it’s not) and that his Supreme Court choice Brett Kavanaugh finished atop his class at Yale Law School (the school doesn’t rank students). Just last week, after making an abrupt, unilateral decision to pull U.S. troops from Syria, Trump tweeted that Russia was “not happy” about the decision. Hours earlier, Russian President Vladimir Putin had cheered the move.

The cumulative effect has been to diminish the authority with which White House pronouncements are received.