A group of Democratic lawmakers are calling on President Joe Biden to investigate grocery store chains for price manipulation, writing in a letter sent Monday morning that he should use executive authority to take additional enforcement action to address rising food prices without the help of Congress. [time-brightcove not-tgx=”true”] The letter, shared exclusively with TIME, comes after a report from the Federal Trade Commission (FTC) found that major grocery chains took advantage of supply chain disruptions during the pandemic to hike up prices to increase their profits.