Says a lot about Trump's utter contempt for anyone not named Donald Trump.
Trump was - still is - a New York City landlord. He knows full well what it means to flush foreign material down a toilet, particularly with an older septic system like the White House. He knows, and did it anyway.
Remember early in his term, when he called the White House a dump? This was his way of showing he meant it.
https://news.yahoo.com/haberman-shares-photos-trump-era-135456424.html