Kejriwal's principal secretory raided by CBI

Yesterday Delhi's CM Arvind Kejriwal's principal secretory's office was raided by CBI in connection with misuse of power and corruption. Avind Kejriwal's main election agenda was removal of corruption from government. But now he is projecting this raid as violation of federal structure and interference in his government. This is a complete U-turn from his earlier stand against corruption. CBI as per its working doesn’t seek approval of head of a department before raiding a government office because it will leak information about the raid and no raid will be successful. Then why should CBI need Arvind Kejriwal's approval? It looks like Arvind Kejriwal's principal secretory has become a honest person after donating his all black money to Aam Admi Party and it is duty of a honest CM to fight for a newly honest IAS official. I don't see anything wrong with CBI raid.