President Donald Trump said Wednesday that Federal Reserve Chair Jerome Powell has kept interest rates too high and that he might call the central bank chief. “I haven’t called him. I might call him,

The president’s about-face on the central bank chief, following advice from his treasury and commerce secretaries, sent markets surging.

The president said he has “no intention” of ousting Jerome H. Powell, the Fed chair, but the administration’s willingness to challenge norms regarding the central bank’s political independence is causing concern.