Senate Republicans are planning to forge ahead on a bid to repeal chunks of ObamaCare and partially defund Planned Parenthood by using a rare fast-track tactic, Fox News has learned.

The effort comes despite some internal turmoil in the Republican ranks. Senate Republican leaders huddled with rank-and-file members Monday night to walk them through the planned package.

The goal is to use a special process – known as budget “reconciliation” -- that would make it easier to pass the measures out of the Senate, following numerous failed attempts.

“Reconciliation” would not only limit amendments and debate, but would ensure that only a simple, 51-vote majority is needed for passage.

Still, the effort is not a sure bet in the Senate -- and would face a certain veto should it reach President Obama.

Several senators may vote no because it only repeals parts of the Affordable Care Act. And some moderate Republicans could peel off over the move to de-fund Planned Parenthood.

That debate has also been jolted by last week’s fatal shootings at one of the group's Colorado clinics – though House Majority Leader Kevin McCarthy indicated Monday that the shootings would not affect a separate House investigation of Planned Parenthood for providing fetal tissue to researchers.

If the Senate does succeed in passing the measure, once it aligns with a House-passed bill it would go to Obama’s desk. The president would be expected to veto.

This debate comes as Congress also tries to tackle a must-pass spending bill in the next two weeks, before a Dec. 11 deadline.

McCarthy predicted Monday that Washington will avoid stumbling into a partial government shutdown over the issue.

"I'm hopeful to get it all done and voted on by the 11th. If not, we're here until the 18th and it won't make any difference. We'll get it done," McCarthy said.

The so-called omnibus spending bill represents a challenge for House Speaker Paul Ryan, R-Wis., who took over the top House job after former Speaker John Boehner, R-Ohio, was forced out this fall over his penchant for looking to Democrats to help pass major legislation like year-end spending bills, among other reasons.

Some conservatives want to attach language to “defund” Planned Parenthood to the budget package as well.

"I'm not optimistic about anything. Seriously," said Senate Minority Leader Harry Reid, D-Nev., as he left Majority Leader Mitch McConnell's office after a 20-minute meeting. "Going to wait and see what happens."

Fox News’ Chad Pergram and The Associated Press contributed to this report.