Contrary to what the President proposes now, he has argued for reduced police funding in the past. Just this February of 2020, the Trump administration proposed a 58% cut in the federal government’s COPS Hiring Program. The COPS hiring program is a program designed to support police department staffing. 
The program was inaugurated during the Clinton administration and since seen a decline in police staffing, mostly because it has had a trend of enduring budget cuts over the years. A trend President Trump was contributing towards as of February. In other words, even before the movement to defund the police began, the President has himself been defunding the police.