The US Supreme Court on Monday agreed to consider gutting the 1973 Roe v. Wade ruling that legalised abortion nationwide, taking up Mississippi’s bid to revive a Republican-backed state law that bans the procedure after 15 weeks of pregnancy.

By hearing the case in their next term, which starts in October and ends in June 2022, the justices will look at whether to overturn a central part of the landmark ruling, a longstanding goal of religious conservatives.

In the Roe v. Wade decision, subsequently reaffirmed in 1992, the court said that states could not ban abortion before the viability of the foetus outside the womb, which is generally viewed by doctors as between 24 and 28 weeks.

The Mississippi law would ban abortion much earlier than that.

The Roe v. Wade ruling recognised that a constitutional right to personal privacy protects a woman’s ability to obtain an abortion.

The court in its 1992 decision, coming in the case Planned Parenthood of Southeastern Pennsylvania v. Casey, reaffirmed the ruling and prohibited laws that place an “undue burden” on a woman’s ability to obtain an abortion.

Abortion opponents are hopeful that the Supreme Court will narrow or overturn the Roe v. Wade decision. The court moved from a 5-4 to a 6-3 conservative majority following Senate confirmation last year of Republican former President Donald Trump’s third appointee, Justice Amy Coney Barrett.

The Supreme Court in a 5-4 June 2020 ruling struck down an abortion law in Louisiana that imposed restrictions on doctors who perform the procedure. The late liberal

Justice Ruth Bader was still on the court at the time, and conservative Chief Justice John Roberts voted with the court’s liberal wing in the ruling. Roberts at the time, however, made it clear that he voted the way he did because he felt bound by the court’s 2016 ruling that struck down a similar law in Texas.

The 2018 Mississippi law, like others similar to it passed by Republican-led states, was enacted with full knowledge that was a direct challenge to Roe v. Wade.

After the only abortion clinic in Mississippi, Jackson Women’s Health Organisation, sued to try to block the measure, a federal judge in 2018 ruled against the state. The New Orleans-based 5th US Circuit Court of Appeals in 2019 reached the same conclusion, prompting the state to appeal to the Supreme Court.

“States may regulate abortion procedures prior to viability so long as they do not impose an undue burden on the woman's right, but they may not ban abortions. The law at issue is a ban,” 5th Circuit Judge Patrick Higginbotham wrote.

Abortion remains a divisive issue in the United States, as in many countries. Christian conservatives are among those most opposed to it. Abortion rates in the US have steadily declined since the early 1980s, reaching the lowest levels on record in recent years.