Sen. Chris Murphy Christopher (Chris) Scott MurphyDemocratic senator calls for 'more flexible' medical supply chain to counter pandemics The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon GOP chairman to release interim report on Biden probe 'in about a week' MORE (D-Conn.) on Wednesday pushed back against statements by Senate Republicans and President Trump that the latest GOP effort to repeal and replace ObamaCare includes protections for pre-existing conditions.

"This is a lie. A horrible knowing fabrication," Murphy tweeted Wednesday night. "The bill is intentionally constructed to force states to drop this protection."

This is a lie. A horrible knowing fabrication. The bill is intentionally constructed to force states to drop this protection. https://t.co/t6z2bckyN5 — Chris Murphy (@ChrisMurphyCT) September 21, 2017

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His comments came after Trump tweeted he wouldn't sign a health care bill if it didn't include these protections.

"I would not sign Graham-Cassidy if it did not include coverage of pre-existing conditions," Trump tweeted Wednesday night. "It does! A great Bill. Repeal & Replace."

The Senate could vote on the latest ObamaCare repeal-and-replace plan next week.

The proposal, sponsored by Sens. 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.) and 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.), would largely dismantle ObamaCare and convert its funding to block grants that would be delivered to states, which could then spend the funding on their own health needs.

The debate over pre-existing conditions centers on a provision that allows states to waive an ObamaCare rule that prevents people with pre-existing condition from being charged higher premiums due to an illness. Critics of the bill argue that if states waived the rule, coverage could become unaffordable for people with pre-existing conditions.

Cassidy and Graham have pushed back against claims that their bill would hurt people with health problems.

Cassidy says states would have to show how they are providing "adequate and affordable" coverage to people with pre-existing conditions before waiving the ObamaCare rule.