Sen. Lindsey Graham Lindsey Olin GrahamMcConnell locks down key GOP votes in Supreme Court fight Will Republicans' rank hypocrisy hinder their rush to replace Ginsburg? Momentum growing among Republicans for Supreme Court vote before Election Day MORE (R-S.C.) on Wednesday shot back at late-night host Jimmy Kimmel for his "unfair" criticism of Sen. Bill Cassidy William (Bill) Morgan CassidyCoushatta tribe begins long road to recovery after Hurricane Laura Senators offer disaster tax relief bill Bottom line MORE (R-La.) and his involvement in the new GOP health-care bill, saying Kimmel likely read a "liberal talking point" before hastily attacking the lawmaker.

"I bet you he never called Sen. Cassidy and said 'would you please set this straight?' I bet he looked at some liberal talking point, bought it hook, line and sinker, and went after Bill Cassidy without talking to him, and I think that's unfair,” Graham said on "FOX & Friends."

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Graham said that their health-care bill will cover pre-existing conditions, while adding that he sympathized with Kimmel, whose child had been diagnosed with a heart condition shortly after birth.

"I understand the emotional nature of having a sick child, and we're all grateful your child is doing well. Bill Cassidy is a doctor who worked in a nonprofit hospital serving the underprivileged. Factually, our bill requires pre-existing illnesses to be covered in the block grant," Graham said in part, adding that the bill would allow "50 states to come up with solutions to help sick people, not just some bureaucrat in Washington."

Kimmel took aim at Cassidy on Tuesday, saying the lawmaker lied when he promised an affordable health-care bill that would pass the “Jimmy Kimmel test.”

The comedian accused the Louisiana senator of failing to fulfill the promises he had made following Kimmel's emotional appeal in May to keep ObamaCare in place after his son's heart problem had been detected.

The measure, put forward by Cassidy, Graham and other Republican lawmakers, aims to give more power to states by converting ObamaCare funding for subsidies — which help people afford health-care coverage and pay for Medicaid expansion — into block grants to states.

Cassidy similarly insisted Wednesday that Kimmel does not fully understood the protections included in the Graham-Cassidy bill.

"I'm sorry he does not understand," Cassidy said Wednesday on CNN's "New Day," adding the bill protects "those with pre-existing conditions."