Stock investors are starting to tune out President Donald Trump’s trade war. After frantically pushing share prices higher and lower for weeks on each twist and turn in Trump’s tariff negotiations, investors are now largely ignoring new announcements.

Now they have a trade war problem to worry about again. Stock futures fell sharply Friday after President Donald Trump brought the trade war back to the forefront with threats of massive tariffs against America’s most valuable company and one of its most important trading partners.

U.S. stock index futures were muted on Friday as investors were risk-averse after President Donald Trump's tax and spending bill won a crucial House vote the previous day, raising concerns about the country's deteriorating fiscal outlook.

Stock futures point to a lower open as investors kept an eye on Treasury yields as President Donald Trump's tax bill continues to travel through Congress.