House Democrats Wednesday quickly denounced a scheduled vote on legislation to repeal and replace Obamacare, predicting that Republicans on Thursday "are going to tatoo this moral monstrosity to their foreheads."

Minority Leader Nancy Pelosi, D-Calif., said Republicans are rushing to pass the legislation without determining how new changes to the bill would affect the cost by waiting for a price tag from the Congressional Budget Office.

Changes to the bill would allow states to waive the Obamacare mandate requiring coverage for pre-existing conditions. Republicans this week added new language providing an additional $8 billion to help offset the cost for those who with pre-existing conditions who are charged higher premiums.

"Forcing a vote without a CBO score shows that Republicans are terrified of the public learning the full consequences of their plan to push Americans with pre-existing conditions into the cold," Pelosi said in a statement.

Democrats in recent days have held regular press events to highlight their criticisms of the GOP plan. Obamacare passed with all Democratic support and was the signature achievement of the party when they held the majority from 2007 until 2011.

"Trumpcare spells heart-stopping premium increases for Americans with anything from asthma to cancer," Pelosi said. "It's a frightening future for families who need affordable, dependable health care the most."

Minority Whip Steny Hoyer, D-Md., said Republicans could face a backlash from voters if they vote for the measure.

"The American people will surely hold Republicans accountable for their votes tomorrow on whether to advance this deeply flawed TrumpCare bill or to send a message, once and for all, that making Americans pay more for less, discriminating against those with pre-existing conditions, and kicking millions off their coverage will not happen on their watch," Hoyer said.