Is there any bar on allowing outsiders in Cabinet meetings? | Explained

A controversy has broken out over the alleged participation of two private individuals, Vishnu Reddy and John Arockiasamy, at the inaugural meeting of the Tamil Nadu Cabinet held at Fort St. George, the seat of power of the State government, on June 4 under the chairmanship of Chief Minister C. Joseph Vijay, who is heading the State’s first coalition government. Several parties, including the Dravida Munnetra Kazhagam (DMK), the principal Opposition party in the Assembly, have made the allegation and expressed their strong resentment. The State government has been maintaining a studied silence on the issue.