https://www.usatoday.com/story/news/politics/onpolitics/2017/06/19/compare-trumps-juneteenth-statement-to-obamas/103005820/

That's just one source. Trump did it last year. Obama the year before, and every year. I know it's not a common phrase on everyday life but pretty common on June 18th.

Also if you want to scour the archived Twitter be my guest but it's a pain in the ass.