If the United States Congress enacts into law legislation making money available to the state for school construction while the legislature is not in session, the governor or the board as the federal law may require may accept and use the federal money and apply it to the cost of constructing and improving school buildings and facilities to the extent that construction and improvement is authorized by the legislature when federal money becomes available. If a condition to receiving federal money for school construction is that the state increase its expenditures for that purpose over expenditures authorized by the legislature at the time federal money becomes available, the governor or the board as the federal law may require may use money appropriated by the legislature for school construction for matching purposes and may make further federal money available for school construction in addition to state money already appropriated for that purpose. To the extent practicable expenditure of state and federal money shall be limited to projects already programmed by the department and authorized by the legislature at the time federal money becomes available.