Kentucky Democratic Attorney General Andy Beshear has filed a brief with the state Supreme Court about why he thinks a law changing the public pension system is unconstitutional.

The state legislature passed SB 151 in April. It would require all new teacher hires to be moved into a hybrid pension system. It would also restrict how teachers use sick days to calculate their retirement benefits.

The bill was unpopular with public workers. Beshear, who is running for governor in 2019, sued to block the bill. He says lawmakers did not follow the state Constitution when they passed the bill too quickly.

Republican Gov. Matt Bevin says the law does not violate the state Constitution. The court is scheduled to hear the case on Sept. 20.