LONDON (AP) — The British government was back at the country’s Supreme Court on Wednesday, arguing that Prime Minister Boris Johnson’s decision to suspend Parliament just weeks before the country is set to leave the European Union was neither improper nor illegal.

It’s the second day of a historic three-day hearing that pits the powers of Britain’s legislature against those of its executive as the country’s scheduled Brexit date of Oct. 31 looms over its political landscape and its economy.

Government lawyer James Eadie argued that a lower court was right to rule that Johnson’s suspension of Parliament was a matter of “high policy” and politics, not law. Eadie called the decision to shut down Parliament “inherently and fundamentally political in nature.”

He said if the court intervened it would violate the “fundamental constitutional principle” of the separation of powers between courts and the government.

“This is, we submit, the territory of political judgment, not legal standards,” Eadie said.

The government’s opponents argue that Johnson illegally shut down Parliament just weeks before the country is due to leave the 28-nation bloc for the “improper purpose” of dodging lawmakers’ scrutiny of his Brexit plans. They also accuse Johnson of misleading Queen Elizabeth II, whose formal approval was needed to suspend the legislature.

Johnson sent lawmakers home on Sept. 9 until Oct. 14, which is barely two weeks before Britain’s Oct. 31 departure from the EU. He claims the shutdown was a routine measure to enable his Conservative government to launch a fresh legislative agenda and was not related to Brexit.

Eadie rejected claims that the prime minister was trying to prevent lawmakers from blocking his Brexit plans.