A leading pro-life Democrat in the House is threatening to block healthcare reform if Speaker Nancy Pelosi (D-Calif.) doesn't allow a vote that would prevent the bill from funding abortions. 

Rep. Bart Stupak (D-Mich.), co-chairman of the House Pro-Life Caucus, says the Democratic leadership must allow a vote adding the "Hyde Amendment" to the bill. That amendment prevents federal dollars from going to abortion funding.

"First of all, you have to give us our vote," Stupak told CBN News, repeating the message he's relaying to the Democratic leadership. "If you don't give us our vote, everything's off the table."

Stupak said he has enough votes to block the legislation in the House if the Speaker Nancy Pelosi (D-Calif.) prevents a vote on the pro-life proposal.

Stupak added that he's particularly "cautious" about the Hyde Amendment language because the Obama administration has helped beat back previous pro-life efforts this year.

"Every time we've tried to do it this year, under this administration, we've kind of been denied the opportunity to present our amendments, or we have some watered down language," Stupak said.

Republicans and pro-life Democrats tried to add an amendment preventing abortion funding when healthcare legislation was working it's way through the House Energy and Commerce Committee. Pro-choice Democrats successfully blocked it.