An effort to defund Planned Parenthood in the upcoming federal budget is running into a roadblock — two liberal Republicans.

Sens. Susan Collins of Maine and Lisa Murkowski of Alaska may join with Democrats to block any budget that does not funnel millions of tax dollars to the lucrative abortion business.  If they can find one more GOP ally, the bill is dead.

Why are Collins and Murkowski doing this, and what kind of support are they getting from top political bankroller Planned Parenthood?

“Two female Senate Republicans could stop the anti-abortion movement from achieving its most significant win against Planned Parenthood in decades,” POLITICO reports.

“Most Republicans want to eliminate the group’s $555 million in federal funding as part of their bill to repeal Obamacare. But as Majority Leader Mitch McConnell tries to solve the legislative Rubik’s Cube of finding 50 votes for repeal, he may have to drop the Planned Parenthood cut to win the support of the two Republican moderates, Sens. Susan Collins of Maine and Lisa Murkowski of Alaska,” POLITICO reports.

Republicans control 52 votes in the 100-member Senate.  If Murkowski and Collins were to vote with Democrats against a budget that defunds Planned Parenthood, Republicans can still pass it with Vice-President Mike Pence’s tie-breaking vote.

But if Murkowski and Collins can convince one more Republican to join them, the effort to defund Planned Parenthood is dead.

Several Republicans could flip under what will be an all-out, bloodthirsty assault by the abortion industry and mainstream media.

For a barometer of the Senate’s commitment to the right to life, of the chamber’s 52 Republicans, only 10 have co-sponsored Sen. Rand Paul’s “Life At Conception” Act, which overturns Roe v. Wade by declaring that pre-born people are protected by the Fourteenth Amendment.

Only Sen. Jim Risch (R-ID,) Sen. Mike Rounds (R-SD,)  Sen. Mike Crapo (R-ID,)  Sen. Tim Scott (R-SC,)  Sen. John Thune (R-SD,) Sen. David Perdue (R-GA,)  Sen. Jim Inhofe (R-OK,) Sen. John Boozman (R-AR,) Sen. John Kennedy (R-LA,) and Sen. Roger Wicker have joined Paul in supporting “Life At Conception.”

That leaves 41 Senate Republicans open to protecting Planned Parenthood, including “moderates” like Tennessee’s Bob Corker and Lamar Alexander, Murkowski’s Alaska colleague Dan Sullivan, Arizona’s John McCain and Jeff Flake, and Nevada’s Dean Heller.

A vote to preserve Planned Parenthood’s half-billion dollars each year in taxpayer funding could prove lucrative for any Republican who joins Murkowski and Collins.

The Sunlight Foundation reports in the 2012 elections, Planned Parenthood’s advocacy arm and super-PAC spent between $12 million supporting pro-abortion and opposing pro-life candidates.

Planned Parenthood’s spending spree resulted in 99 percent of their supported candidates winning.

They spent another $14 million in the 2014 mid-term elections.

In the past the group has endorsed and donated to Collins, and several other liberal Republicans.

But with half a billion dollars in taxpayer funding at stake, Planned Parenthood may be much more willing to spend $14 million re-electing Senate Republicans who vote to keep the taxpayer cash flowing.