The change could calm widespread protests, and would ease the impact to a world economy already struggling with high inflation, an energy crisis and disrupted food supply.
When President Mauricio Macri requested early release of a $50 billion loan, he said it was to assuage market watchers' fears. But the opposite happened — and the central bank felt it had to step in.
It was the second time in a month that President Trump had taken aim at the Fed. In a Reuters interview, he also accused China and Europe of manipulating their currencies to gain leverage in trade.
After nine years of a debt crisis that spawned economic upheaval and austerity measures, Athens will regain a degree of control over its finances, but officials say it's not out of the woods yet.
Lagarde, who appeared in court in Paris, is accused of negligence in connection with her oversight of a 2008 case when she was France's finance minister. She has led the IMF since 2011.
The U.S. economy is projected to see 1.6 percent growth this year, down from the 2.2 percent that the IMF had previously forecast. Globally, growth is seen essentially moving sideways in 2016.