Foster said the DUP strongly desires "an immediate return of devolution," and that its restoration does not lie "only in the hands of the Democratic Unionist Party."
"We have put down no preconditions or 'red lines' ahead of the restoration of the Executive. We would nominate Ministers today," she noted.
The DUP leader said she offered in August 2017 to seek "a reasonable and balanced accommodation for the Irish Language," but that "that offer was rejected by both Sinn Fein and the SDLP within 90 minutes."
She also noted that even were devolution restored, it would not of itself be "an absolute safeguard against abortion liberalisation."
"The DUP is the only pro-life party in the [Northern Ireland] Assembly" besides Jim Allister, the Traditional Unionist Voice's sole member of the legislative assembly, she said. "We have 28 seats out of 90."
Sinn Fein supports the liberalization of abortion law, while the remaining parties allow their MLAs a conscience vote on the topic.
Foster said that while abortion law "would come before the Assembly quickly after devolution is restored," the change effected by the Northern Ireland (Executive Formation etc) Act 2019 "is far beyond anything any NI Assembly would ever have endorsed. Having the NI Assembly back up and running before the 21stOctober would give all MLAs the opportunity to shape any future laws."
Bills to legalize abortion in cases of fatal fetal abnormality, rape, or incest failed in the Northern Ireland Assembly in 2016.
"Anyone who cares about the legislative framework governing abortion in Northern Ireland must also look beyond 21st October and ask all MLAs what they believe the law should say," Foster said.
The DUP "want to see the Assembly restored so that local elected representatives can frame the laws for the people of Northern Ireland," the party leader stated.
"Both getting devolution back and defending a pro-life policy have been and will continue to be, fundamental priorities for the Democratic Unionist Party, but it is unfortunately simplistic and mistaken to assume progress on one will resolve the other in the manner we all require."
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Northern Irish women have been able to procure free National Health Service abortions in England, Scotland, and Wales since November 2017.
The Northern Ireland bill was passed by the British parliament in July.
The abortion amendment was introduced by Stella Creasy, a Labour MP who represents a London constituency. Earlier this year Creasy intended to propose an amendment to a draft Domestic Abuse Bill that would give the British parliament jurisdiction over abortion laws throughout the United Kingdom. However, the bill's scope was restricted to England and Wales by the Conservative government.
Creasy also introduced an amendment to the Northern Ireland (Executive Formation and Exercise of Functions) Act 2018 to repeal Northern Irish law on abortion and gay marriage, which was defeated.