US stock indices fell in early trading on Monday, as Dow Jones pulled back from its records hit on Friday.
This comes as the new mutated Delta variant is spreading in many countries around the world.
The average daily Covid-19 infection rate has increased in many countries around the world, led by the US, which is now hit by a new wave of infections.
Treasury Secretary Janet Yellen urged lawmakers to raise the debt ceiling, to support the federal government and prevent a partial shutdown of some agencies.
As for stocks, Dow Jones fell 0.3% or 120 points to 35,088 as of 14:08 GMT, and S&P 500 fell 0.2% or 8 points to 4,427, while Nasdaq fell 0.1% or 4 points to 14,831.