Donald Trump’s administration on Monday pushed forward in defending US rules easing access to the abortion drug mifepristone from a legal challenge that began during Democratic former president Joe Biden’s administration.

The US Department of Justice in a brief filed in Texas federal court urged a judge to dismiss the lawsuit by three Republican-led states on procedural grounds.

While the filing does not discuss the merits of the states’ case, it suggests the Trump administration is in no rush to drop the government’s defense of mifepristone, used in more than 60% of US abortions.