Amazon will stop forbidding third-party merchants who list on its e-commerce platform in the United States from selling the same products on other sites for lower prices, reports Axios.

The company’s decision to end its price parity provision comes three months after Sen. Richard Blumenthal urged the Department of Justice to open an antitrust investigation into Amazon’s policies and a few days after Democratic presidential candidate Sen. Elizabeth Warren announced she would make breaking up Amazon, Google and Facebook a big part of her campaign platform.

Also called “most favored nation” (MFN) requirements, Amazon’s price parity provisions gave it a competitive edge, but because of its size, also led to concerns about its impact on competition and fair pricing for consumers. Amazon stopped requiring price parity of its European Union sellers in 2013 after it was the subject of investigations by the United Kingdom’s Office of Fair Trading and Germany’s Federal Cartel Office.

In a statement, Blumenthal said Amazon’s “wise and welcome decision comes only after aggressive advocacy and attention that compelled Amazon to abandon its abusive contract clause.” He added that “I remain deeply troubled that federal regulators responsible for cracking down on anti-competitive practices seem asleep at the wheel, at great cost to American innovation and consumers.”

TechCrunch has contacted Amazon for comment.