To achieve investment objective the Fund invests at least 80 percent of its net assets, plus borrowings for investment purposes, in U.S. Treasury bills. Under normal circumstances, the Fund expects to maintain a dollar-weighted average portfolio maturity of approximately 90 days or less although the Funds dollar-weighted average portfolio maturity may modestly exceed 90 days from time to time due to U.S. Treasury auction schedules, settlement timing, weekends, holidays, market conventions, fund flows, or other portfolio management considerations.