Markets register a shock, but is Trump right to blame the Fed?

WASHINGTON (Reuters) - It takes a lot to kill an economic expansion, typically requiring a major shock to bring growth to a halt and trigger a U.S. recession.This week investors signalled that moment may have arrived, and one big question is whether that shock has come from President Donald Trump's trade war or a mistake by policymakers at the U.S. Federal Reserve.As bond markets flashed concern about recession on Wednesday and major stock indices cratered, Trump put the blame squarely on the..