(Reuters) -U.S. Senators Ron Wyden and Elizabeth Warren wrote a letter to UnitedHealth executives asking for information about the loans the healthcare conglomerate provided after the cyberattack at its tech unit last year.

In a letter to UnitedHealth CEO Stephen Hemsley and the group’s industrial bank Optum Financial’s chief executive, Dhivya Suryadevara, senators expressed concern over reports that the company used aggressive tactics to demand immediate loan repayments from healthcare providers, including threats to withhold payment for doctors’ health insurance claims, if they do not pay in full immediately.

The cyberattack at Change Healthcare — the largest healthcare data breach in the United States to date — caused widespread disruptions in claims processing and impacted patients a

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