The US Justice Department has asked a federal court in Texas to stop the enforcement of a new state law banning most abortions in the jurisdiction while it decides the case.
The Texas law, known as SB8, prohibits abortions once medical professionals can detect cardiac activity, usually at around six weeks, before some women know they are pregnant.
Courts have blocked other states from imposing similar restrictions, but Texas’ law differs significantly because it leaves enforcement to private citizens through civil lawsuits instead of criminal prosecutors.
The law came into effect earlier this month after the Supreme Court declined an emergency appeal from abortion providers asking that it be stayed.
Last week, the Justice Department filed a lawsuit in Texas asking a federal judge to declare that the law is invalid because it unlawfully infringes on the constitutional rights of women and violates the Supremacy Clause of the Constitution, which says federal law supersedes state law.
The department made a similar argument in seeking the restraining order or temporary injunction and said that its challenge was likely to be successful.
“When other states have enacted laws abridging reproductive rights to the extent that SB8 does, courts have enjoined enforcement of the laws before they could take effect,” it said.
Under the Texas law, a person could bring a lawsuit – even if they had no connection to the woman getting an abortion – and could be entitled to at least 10,000 US dollars (£7,000) in damages if they prevailed in court.
The Texas law is the nation’s biggest curb to abortion since the Supreme Court affirmed in the landmark 1973 decision Roe v Wade that women have a constitutional right to an abortion.
Abortion providers have said they will comply, but already some of Texas’ more than 20 abortion clinics have temporarily stopped offering abortion services altogether. Meanwhile, clinics in neighbouring states have seen a surge in patients from Texas.