The leak of a U.S. Supreme Court draft opinion that would overturn the constitutional right to abortion is a major breach of confidentiality that has heightened the stakes in an already politically-charged case, experts say.

Politico on Monday night published a draft majority opinion that it had obtained striking down the landmark 1973 Roe v. Wade decision, which guaranteed the right to abortion nationwide. It was a sign that the court's 6-3 conservative majority was ready to flex its muscle.

While the substance of the draft sparked praise from anti-abortion conservatives and Republicans and condemnation from abortion rights advocates and Democrats, many court watchers blasted on the leak itself as a rare if not unprecedented occurrence.