A handful of congressional Democrats have encouraged federal probes into Abbott’s handling of the contamination of formula products, which ultimately triggered a major recall and shut down a key plant located in Sturgis, Mich. last February. A whistleblower alleged Abbott employees falsified documents and covered up food safety violations from FDA inspectors before the recall.

The DOJ and FDA declined to comment on the investigation.

The Sturgis plant had produced about one-fifth of the nation’s infant formula supply, and the closure triggered massive shortages that rippled through the country and months later sparked a political crisis for President Joe Biden.