U.S. Treasury Secretary Janet Yellen called for greater transparency around the use of International Monetary Fund resources and on existing stocks of debt as global finance chiefs consider an expansion in the IMF's lending firepower.

Janet Yellen won confirmation to become U.S. treasury secretary, building out President Joe Biden's team as the administration struggles to win bipartisan support for a $1.9 trillion covid-19 relief plan for shoring up a weakening economic recovery.