Sen. Cory Booker (D-NJ) called upon Congress to investigate any possibility of insider trading after President Donald Trump told people to buy stocks before reversing his tariff policy last week.

Less than a week after Trump enacted what he called “reciprocal tariffs” on nearly every nation, his administration said they would be paused for 90 days. On Sunday, Booker joined other elected Democrats who have raised questions about whether there was insider trading in the hours or minutes before Trump’s reversal.