The phrase "make it mandatory that" is correct and commonly used in written English.
Example: The government is considering a law to make it mandatory that all students wear school uniforms.
"Synagogues are free to charge, but to make it mandatory — that's not the way we do it," he said.
The congressional compromise would make it mandatory that the Pentagon completes its review on that timetable.
Make it mandatory that dietary supplement manufacturers register their products with the FDA.
"And make it mandatory that all their investments go in a blind trust.
University requirements and government regulations make it mandatory that overtime hours worked by non-exempt employees be recorded and compensated.
Shorten the enrollment period and make it mandatory that people stay in the pool for at least a year.
Kuwait has detained 90 people in connection with the bombing, closed a charity for alleged militant ties in raising funds for Syrians and its parliament passed a law making it mandatory that authorities keep a record of all residents' DNA.
The N.F.L. is considering having a standard interview and making it mandatory that teams share all information.
"Philosophically, what is it about a work of art that makes it mandatory that it should be available for nothing?" he has asked).
We have not meant to imply by anything said in this opinion that allowance of a credit for other taxes paid to Washington made it mandatory that there should be a like allowance for taxes paid to other states.
He also said the offering plan he expected to submit to the attorney general's office in 90 days would include a provision making it mandatory that apartment buyers participate in the purchase of the building and land.
