Vijayabaskar, Sarathkumar and S Geetha Lakshmi, the Vice-Chancellor of Dr MGR University, have been directed to appear before the department for further questioning on April 17, official sources said.
Earlier, Income Tax officials had conducted searches at the premises of Vijayabaskar, Sarathkumar and Geetha Lakshmi.
All the three have been separately questioned by the I-T sleuths since Monday.
The searches on the premises of an associate of the minister last week allegedly revealed routing of Rs 89 crore for "distribution among voters" in the RK Nagar Assembly constituency where by-election was due on April 12.
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