BY A STAFF REPORTER: ED does not want to leave any loophole in the investigation of Delhi's excise policy. As a result, this time there was no exception. The Enforcement Directorate (ED) on Thursday summoned Delhi Chief Minister Arvind Kejriwal's personal assistant for questioning in connection with its probe into the excise scam. However, there has been no immediate reaction from the Aam Aadmi Party or the chief minister on the issue.