Trump's default mode is to describe all unwelcome facts as the result of cheating by his opponents.
Fears of a China-led global slowdown, along with oil's steep slide, have dampened the market's expectations for a hike.
Even projections for future rate hikes have coalesced.
The move was expected and signals a recovery in the economy since the 2008 financial crisis.
Yellen spoke a week after the Fed delayed a long-anticipated rate hike.
Yellen appeared to lose her place and stopped several times during a speech in Amherst.
A moderately growing U.S. economy can’t sustain growth abroad on its own for long.