In the most recent (Mar. 20, 2019) FOMC Press conference, Powell said this:
So, global economy was a tailwind for the United States in 2017. That was the year of synchronized global growth, and we began 2018 expecting and hoping for more of the same. What happened instead is that the global economy started to gradually slow, and now we see a situation where the European economy has slowed substantially and so has the Chinese economy, although the European economy more. And just as strong global growth was a tailwind, weaker global growth can be a headwind to our economy.
His logic makes sense, and yes this is a world of interconnected financial markets, but I still wonder is Powell's assertion axiomatic here with the larger community of economists?
Just merely playing devil's advocate, I would suspect that because of the Eurozone troubles in recent years, this helped the dollar stay stronger than it would have otherwise, citaris paribus. Not to say that currency valuation is everything, but is there really no counter argument for Powell's stance?