Delhi chief minister Arvind Kejriwal on Friday launched another attack on Prime Minister Narendra Modi by accusing him of being ‘too small in his thinking.’

Posting an old official letter, which appeared to suggest that Modi had held personal conversation to ‘victimize’ the Magsaysay Award winner and the then Chief Vigilance Officer, Sanjiv Chaturvedi, of his duty.

His tweet said, “Read this letter-how Modi ji personally makes telephone calls to victimize inconvenient officers. Modiji too small in his thinking.”

Read this letter-how Modi ji personally makes telephone calls to victimize inconvenient officers. Modiji too small in his thinking https://t.co/F2ZwuKKh5O — Arvind Kejriwal (@ArvindKejriwal) February 17, 2017

Chaturvedi, known as an upright civil servant for his no-nonsense attitude towards corrupt practices, was unceremoniously removed from his post as the AIIMS’ CVO, soon after Modi government assumed ;power at the Centre in 2014.

Later speaking to Janta Ka Reporter, Chaturvedi had slammed the Modi government for carrying out sustained vendetta against those who fighting against corruption.

He had said, “This government’s attitude has all along been against those fighting against corruption. As public servants, we are bound by the constitution. For us the constitution of India is our biggest ideology. Political parties and governments have neither bothered me in the past nor does it bother me now. Neither have I ever had any expectations nor have I ever worried about the consequences.)”

Chaturvedi, who has earlier served as the Chief Vigilance Officer (CVO) at AIIMS during 2012-14, is an Indian Forest Service officer and currently the deputy secretary of All India Institute of Medical Sciences (AIIMS).

In 2014, Chaturvedi was relieved from the additional charge of CVO. Although he continued to retain the Deputy Director post at AIIMS, Chaturvedi had alleged that his removal from the CVO post was a result of campaign by corrupt officials. Allegations surfaced of BJP leader JP Nadda acting against Chaturvedi on behalf of Vineet Chaudhary, an IAS officer from his own state, Himachal Pradesh.

During his stint as AIIMS CVO, Chaturvedi initiated actions in around 200 corruption cases; punishment was imposed in 78 cases, chargesheet was issued in 87 cases and more than 20 cases were referred to CBI for criminal investigation.