Federal Reserve Chair Kevin Warsh has opened a dramatic new front with Donald Trump after leading a unanimous quarter-point interest rate hike, pushing the federal funds target range to 3.75%–4% despite the president demanding rates at 1% or lower.Trump reacted angrily, calling for rates to be cut “fast” and intensifying pressure on the Fed as inflation remains stubborn. The clash comes amid wider economic strain from the Iran war and Trump’s tariff battles, including Canada, raising fresh questions over whether the White House could escalate its fight with Warsh and even move toward trying to remove him.