Senator Elizabeth Warren, the Massachusetts Democrat, has asked the Securities and Exchange Commission to investigate whether President Trump violated securities laws while reversing course on his global tariffs.

Early Wednesday, during a period of intensely volatile trading, Mr. Trump wrote on social media, “THIS IS A GREAT TIME TO BUY!!!” Hours later, he announced a 90-day pause on many tariffs, sending the S&P 500 soaring more than 7 percent in just minutes. Wednesday was the best day for the S&P 500 since the recovery from the 2008 financial crisis.

“In recent days, President Trump has announced a series of erratic, reckless tariffs, leading to significant market turmoil,” Senator Warren wrote in a letter to Paul Atkins, the chair of the S.E.C. “As a direct result of this chaos, the U.S. financial markets have experienced dramatic declines over the course of just a few days.”

She added, “It is unclear which officials and affiliates

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