Trump is basically saying:
“If Fed Governor Cook doesn’t quit, I’ll fire her.”
The Fed (Federal Reserve) is like the U.S. central bank, it controls money supply, interest rates, and inflation.
Cook is one of the governors who helps make those decisions.
Trump is unhappy with how the Fed is handling money policies (probably interest rates, inflation, or economy control).
By threatening to fire her, he’s showing he wants more control over how the Fed runs things.
Normally, the Fed is supposed to be independent (not under direct political control), so this creates tension and uncertainty in financial markets.
In simple terms: Trump doesn’t like how the Fed is running the money game, so he’s pressuring them by targeting Cook.