Three former heads of the central bank say the probe seeks to undermine the Fed's independence and "has no place" in the US.
The move means Russia is being forced to "bear the costs of its illegal war", the US Treasury said.
Israel is urging Western allies to punish Tehran for the missile and drone attack on its territory.
Janet Yellen defends the US, as stock markets fall after credit downgrade.
Polite communication has returned to US-China relations - but progress could easily be knocked back.
But the US Treasury Secretary says the countries still have "significant disagreements" at the end of her trip.
Treasury Secretary Janet Yellen calls on Beijing to invest more in efforts to transition from fossil fuels.
The US Treasury Secretary said decoupling the world’s two largest economies would destabilise the global economy.
The US Treasury Secretary's trip to Beijing comes as tensions between the two countries remain high.
