Investors are worried about the ongoing trade war — and rethinking the safety and soundness of U.S. government debt.

US stock futures were at a standstill as Wall Street looked forward to wrapping up a week marked by growing doubts about the economy's health under Trump's trade and tax agendas.

The market convulsions we're witnessing now reflect the fundamental reality that the world is growing increasingly skeptical about America's capacity to manage its debt.

Wall Street share futures slipped with the dollar on Monday and Treasury yields rose as concerns about erratic U.S. economic policies were underlined by Moody's downgrade of the country's credit rating.

Bond yields inched higher and Wall Street flipped from small gains to losses before the opening bell Thursday after rising U.S. debt sank markets on the previous day. Futures for the Dow Jones Industrial Average fell 0.5% in premarket trading, while futures for the S&P 500 and Nasdaq each slid 0.3%.

Stocks have rallied this week after the U.S. and China agreed on a 90-day pause for most of their punishingly high tariffs