What makes you think that a stronger dollar necessarily means a stronger American economy?

Trump was quite unambiguous about his plans to weaken the US dollar. In fact, he already sent the dollar spiraling down a little when he told in his WSJ interview last Friday that the dollar had been "too strong". I don't know how that can be possibly misconstrued toward "a much stronger dollar". If Trump is actually going to "make America great again", he should first make American goods competitive in the world markets, but the only American good that was competitive as of late was the American dollar itself