The Georgia hospital that failed to save Amber Thurman may have broken a federal law when doctors there waited 20 hours to perform a procedure criminalized by the state’s abortion ban, according to Sen. Ron Wyden, chair of the Senate Finance Committee.

The Emergency Medical Treatment and Labor Act, or EMTALA, requires hospitals to provide emergency care to stabilize patients who need it — or transfer them to a hospital that can. Passed nearly four decades ago, the law applies to any hospital with an emergency department and that accepts Medicare funding, which includes the one Thurman went to, Piedmont Henry in suburban Atlanta. The finance committee has authority over the regulatory agency that enforces the law.

In a letter sent Monday, Wyden, an Oregon Democrat, cites ProPublica’s investigation into Thurman’s death, which was found preventable by a state committee of maternal health experts. The senator’s letter asks Piedmont CEO David Kent whether the hospital has delayed or denied emergency care to pregnant patients since Georgia’s abortion ban went into effect. (Kent did not respond to requests for comment.)