In public and private, the big names of high finance are trying to get a message across to President Trump: stop the madness.

For weeks, as the contours of Trump’s sweeping tariff plans came in and out of focus, Wall Street’s leaders kept any concerns they had to themselves. Now, after a three-day market meltdown that has erased trillions of dollars in value from U.S. stocks, some are speaking out, including those who have been vocal supporters of Trump.