WASHINGTON (AP) — Mr. Trump went to Washington. And he changed it.

In his first two years in office, President Donald Trump has rewritten the rules of the presidency and the norms of the nation's capital, casting aside codes of conduct and traditions that have held for generations.

In Trump's Washington, facts are less relevant. Insults and highly personal attacks are increasingly employed by members of both parties. The White House press briefing is all but gone, international summits are optional, the arts are an afterthought and everything — including inherently nonpartisan institutions and investigations — is suddenly political.

Taking a wrecking ball to decorum and institutions, Trump has changed, in ways both subtle and profound, how Washington works and how it is viewed by the rest of the nation and world.

"He's dynamited the institution of the presidency," said Douglas Brinkley, presidential historian at Rice University. "He doesn't see himself as being part of a long litany of presidents who will hand a baton to a successor. Instead, he uses the presidency as an extension of his own personality."

Is this a one-president aberration? Or has the White House forever changed? Whether the trends will outlast Trump's presidency is a question that won't be answered until there is a new occupant in the Oval Office, but Brinkley predicts "no future president will model themselves on him."