Sen. Richard Burr of North Carolina, the chairman of the Senate Intelligence Committee, turned over his phone to agents after they served a search warrant on the lawmaker at his residence in the Washington area, the official said, speaking on condition of anonymity to discuss a law enforcement action.
The seizure represents a significant escalation in the investigation into whether Burr violated a law preventing members of Congress from trading on insider information they have gleaned from their official work.
Burr sold a significant percentage of his stock portfolio in 33 different transactions on Feb. 13, just as his committee was receiving daily coronavirus briefings and a week before the stock market declined sharply. Much of the stock was invested in businesses that in subsequent weeks were hit hard by the plunging market.
