What the Success Academy charter school network could not get through the courts or from the New York State Education Department, it may get from the governor: the ability to run prekindergarten programs without oversight from New York City.

In the final hours of the legislative session this summer, as Mayor Bill de Blasio and the Assembly were pushing to get mayoral control of the city’s schools extended, the Republican-controlled Senate demanded some concessions for charter schools. It introduced a vague provision that appeared to grant the charter schools committee of the State University of New York’s board of trustees new powers to regulate the charter schools it oversees. Charter school supporters claimed that the provision would allow SUNY to waive requirements that limit the number of uncertified teachers that charter schools can employ.

But it turns out that the Senate Republicans, who have received substantial support from wealthy charter school supporters, had other goals in mind, as well.

In a letter to Gov. Andrew M. Cuomo dated June 20, and not previously reported, the Senate majority leader, John J. Flanagan, wrote that the intent of the provision “was to provide SUNY with statutory authority to exempt charter schools from rules and regulations that were hampering innovative teaching and learning.”