A group of people will rally outside Sen. Pat Toomey's office on Monday to protest the Graham-Cassidy health care bill.
Analysts say Pennsylvania would lose billions of federal health care dollars if the bill is passed.
So far, Toomey has not said which way he will vote.
The rally is scheduled to start at noon.
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The effort to scrap Obamacare is already in jeopardy.
Republican Sen. Susan Collins said she does not see herself voting for the bill.
Sen. Ted Cruz also said that right now he doesn't back it.
Cruz and Collins join Sens. John McCain and Rand Paul in opposition to the legislation.
At least 50 votes are needed to pass it.
Sen. Bill Cassidy and former Sen. Rick Santorum will defend the bill at a senate hearing Monday.
Cox Media Group