(Olympia, WA) -- Oregon leaders are blasting a new Washington state proposal that would enact a tax on Oregon-bound gasoline. The proposal introduced earlier this month would create a tax of up to six cents per gallon for some fuel being exported from Washington to states with lower gas taxes than Washington's. Oregon Governor Kate Brown posted a tweet late last week calling the proposal "unacceptable" and saying she's discussed the matter with Washington Governor Jay Inslee. Oregon Republican state Representatives Shelly Boshart Davis and David Brock testified against the proposal in the Washington Legislature. Boshart Davis calls the tax proposal "offensive."