Answer:
His/her role is to chair the senate when the vice president of the senate is absent. In addition, he/she can sign new legislation and issue the oath of office of new senators.
Step-by-step explanation:
The president pro tempore is the term used to designate a senator whose primary function is to replace the senate vice president when he is absent. This position is one of the most important in the federal senate because it allows an elected senator to lead the country's legislative body. As has been said before, the role of the president for the time being is to chair the senate when the vice president of the senate is absent. In addition, the president may temporarily sign new legislation and issue the oath of office to new senators.