A group of Washington state senators vowed Tuesday to increase funding for higher education by $300 million but declined to say how they would get the money at a time when lawmakers are already struggling to balance the budget.

Republican Sen. Michael Baumgartner, who developed the plan supported by a GOP-dominated coalition, said it is possible to write a budget that balances state spending while increasing funding for state colleges and universities. He said it will be a matter of prioritizing where government dollars go.

"We're going to make higher education a priority," Baumgartner said.

Senate leaders declined to explain how they would pay for the proposal. Lawmakers already face more than a $1 billion shortfall in the next two-year budget cycle and are separately under court order to expand funding for K-12 education.

The senators also propose to require a 3 percent reduction in tuition for in-state students. They also say this will help manage the long-term financial concerns in the state's prepaid tuition program.

Under the plan, $50 million of the new higher education money would be awarded to schools based on metrics, such as the number of undergraduates in degrees such as science or engineering, the retention rate of first-year students and the average time it takes to complete an undergraduate degree.