The political pressure should play no role in the court’s decision, said Nora Freeman Engstrom, a professor at Stanford Law School.

“The Trump administration has made clear how it wants the supreme court to rule – but the court is going to read Fifra, and … the court is going to conduct its own pre-emption analysis,” she said.

“In some areas, the views of the federal government are entitled to special deference. This isn’t one of those areas.”