Sen. Joni Ernst Joni Kay ErnstPoll shows tight Senate race in Iowa Will Republicans' rank hypocrisy hinder their rush to replace Ginsburg? Momentum growing among Republicans for Supreme Court vote before Election Day MORE (R-Iowa) faced a heated crowd at a town hall at the University of Iowa on Friday, where attendees booed and jeered the junior Iowa senator over the GOP's latest effort to repeal and replace the Affordable Care Act.

At the town hall, according to the Des Moines Register, Ernst faced questions about her support for the proposal introduced this month 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.).

That bill aims to do away with ObamaCare insurance subsidies and the Medicaid expansion, and instead convert those pots of money into block grants for the states.

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Ernst sought to defend her position on Republicans' efforts to repeal and replace former President Obama's signature health-care law, saying the GOP needed to act swiftly to fix the individual insurance market and that the Graham-Cassidy proposal offered states an opportunity to develop health-care systems that fit their individual needs.

According to the Register, at least two attendees at Ernst's town hall were taken out of the meeting by police.

The Graham-Cassidy proposal was dealt a potentially decisive blow on Friday when Sen. John McCain John Sidney McCainMomentum growing among Republicans for Supreme Court vote before Election Day McConnell urges GOP senators to 'keep your powder dry' on Supreme Court vacancy McSally says current Senate should vote on Trump nominee MORE (R-Ariz.) announced that he would not vote for the measure.

Republicans face a Sept. 30 procedural deadline to pass such a bill with only a simple majority, and can only afford two GOP defections to approve it.

Sen. Rand Paul Randal (Rand) Howard PaulSecond GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill MORE (R-Ky.) indicated earlier this month that he would not support the proposal, and Sen. Susan Collins Susan Margaret CollinsMcConnell locks down key GOP votes in Supreme Court fight Most Americans think winner of election should pick next Supreme Court justice: poll Murkowski: Supreme Court nominee should not be taken up before election MORE (R-Maine) has said that she's leaning against voting for the bill. McCain's defection is likely to prompt others to follow suit.