This probably was posted but I found it interesting when I heard people talking about it today. The article is from February, 2018.
Snopes rates it false but the pastor Begley stands by his story.
Sounds more like redecorating than exorcism. The first lady is a Latin, so if she wanted an exorcism, she'd have had a Latin Rite priest come with a bell, a book and a candle.
Thus both Begley's account and Snopes' debunking of the notion that Mrs. Trump has the White House exorcised can both be true -- the only thing that's false is Begley's value judgement that was being done when he was a the White House early in Trump's term was an exorcism.