Markets are being driven by politics and hedge funds are already beginning to assess the risk that US President Donald Trump may face impeachment in 2019. It's not the only risk on their radar, of course, and nor is it the most likely. But investors are talking about it as a possibility. At least three Wall Street hedge funds are trying to assess how an impeachment might affect the markets. Investors have a lot to worry about in 2019 — there's the trade war with China, Federal Reserve policy, and oil prices to name a few.