CVS Health, UnitedHealth Group, and Cigna have sued the Federal Trade Commission (FTC), claiming its case against drug supply chain middlemen over high insulin prices is unconstitutional.

The FTC accused these companies’ pharmacy benefit managers (PBMs)—CVS’s Caremark, Cigna’s Express Scripts, and UnitedHealth’s Optum Rx—of inflating insulin costs through a rebate system that boosts their profits.

The lawsuit, filed in Missouri, argues that the FTC’s administrative court process violates due process rights and is unconstitutional.

The companies also claim the FTC’s actions unfairly target the industry without going through federal court, CNBC has reported.

The FTC responded, asserting that these companies are trying to deflect attention from their harmful business practices.

Written by B.C. Begley