WASHINGTON—Janet Yellen, President-elect Joe Biden’s nominee to be Treasury secretary, will confront an economic recovery that appears to be losing momentum and uncertain prospects for additional stimulus from Congress.
If confirmed by the Senate, Ms. Yellen would play a key role pushing for more aid for an economy battered by the coronavirus pandemic and related shutdowns, especially if Congress is unable to reach an agreement on a relief package before Mr. Biden takes office on Jan. 20.
The…