...anti-abortion Democrats will be allowed to offer an amendment during the House health care debate Saturday that would ban most abortion coverage from the public option and other insurance providers in the new so-called "exchange" the legislation would create, three Democratic sources told CNN.

The prohibition would exclude cases of rape, incest or if the mother's life is in danger, known as "Hyde" language.

The hotly anticipated vote on the nearly $1.1 trillion bill by the full House of Representatives is tentatively set for Saturday, but it could be delayed until Sunday. President Obama is expected to visit Capitol Hill on Saturday in hopes of gaining support among Democrats.

House Democratic leadership sources said that win or lose, they hope giving abortion foes the opportunity to vote will clear the way for passage of their health care bill.

Planned Parenthood decried the amendment, saying it would result in the elimination of abortion coverage currently offered by most private health insurance plans.

"This amendment would violate the spirit of health care reform, which is meant to guarantee quality, affordable health care coverage for all by creating a two-tiered system that would punish women, particularly those with low and modest incomes," the group said in a statement.

"Women won't stand for legislation that takes away their current benefits and leaves them worse off after health care reform than they are today."