Powell has frequently noted that it took a decade after the 2008 global financial crisis for the US economy to return to full employment, while inflation consistently fell short of its target.
The benchmark 10-year yield was down 2.3 basis points at 1.5331% in morning trading, at low end of the 1.528% to 1.646% range it has held since April 15.
Treasury auctions of 2-year, 5-year and 7-year notes on Monday and Tuesday totaling $183 billion will also show the market's appetite for US debt.
And it will be up to Janet Yellen, Powell's predecessor as Fed chief who is now Biden's Treasury secretary, to take up the lead in pushing that stimulus package through Congress.