Washington (CNN) — President Obama will meet with members of the House Democratic caucus Saturday in a rare visit to Capitol Hill as he works to push forward proposed health care legislation.

But the contentious issue of abortion is threatening to delay Saturday’s scheduled vote on the nearly $1.1 trillion health care bill by the full House of Representatives and possibly push it back to Sunday, according to two Democratic sources.

In a late night development, anti-abortion Democrats scored a major victory by persuading Democratic leaders to allow them 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.

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