As a direct means of fighting recessions, cutting interest rates is generally ineffective. There is a somewhat beneficial indirect "wealth effect" however, as the dollar weakens and the market rises. What is generally effective, however, is increased government spending and demand side tax cuts and stimulus. (the great recession was, of course, an atypical case, fought, rather brilliantly, with atypical tools.)
As a general rule, I think one should turn a deaf ear to politicians and the media when making investment decisions. With Trump as president, this becomes doubly important. He will say anything, no matter how outrageous, wrong or stupid, to turn the spot light on himself. But fortunately for the nations sake, he is very inconsistent when following through on his seat of the pants promises and threats. If there is a more worthless human being that ever walked the face of the Earth, I can't imagine whom it could be.