President Donald Trump's second term in office has been challenging for investors, at least so far. Trump imposed sweeping tariffs on imports from most countries worldwide. For now, several industries have escaped these trade policies, including pharmaceuticals. However, recent developments suggest that it won't last much longer. That could be bad news for leaders in this sector, including Eli Lilly (LLY -2.28%), the largest pharmaceutical company in the world by market cap. Should investors give up on the ...