(Corrects Gareth Nicholson's title in paragraph 4 to chief investment officer at Nomura International Wealth Management, not chief investment officer at Nomura) By Divya Chowdhury and Mehnaz Yasmin (Reuters) - The Treasury yield curve could steepen as investors demand higher compensation for perceived fiscal and political risk amid rising pressure from the Trump administration on the U.S. Federal Reserve, bond fund managers said on Tuesday. President Donald Trump's persistent criticism of the Fed board ...