Mehbooba, who was not present when Kovind filed his nomination papers, will convene a meeting of MPs and MLAs from the state at her residence, which will be addressed by the former Bihar governor and Dalit activist, BJP sources said.
Her party, the PDP, has assured the BJP, with which it shares power in the state, of its support.
Kovind will be accompanied by Union minister M Venkaiah Naidu and the party's general secretary, Ram Madhav.
External Affairs Minister Sushma Swaraj and BJP's general secretary Anil Jain will be among the leaders who will be with Kovind in the Haryana town, the sources added.
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The BJP hopes that the INLD, led by former Haryana chief minister O P Chautala, will extend its support to him, the sources said.
Later this week, Kovind will visit Tamil Nadu, Kerala and Puducherry in the south.
So far 28 parties have extended their support to the NDA's presidential candidate.
"We are expecting that in next few days, two or three more parties will come forward to support him," a BJP leader said.
With over 62 per cent of the votes firmly behind him, Kovind's election as the next president is almost certain. Besides the BJP and its NDA allies, the TRS, YSRCP, AIADMK, BJD and the JD(U) have also announced their support to him.
Kovind filed his nomination in the presence of Prime Minister Narendra Modi in New Delhi on June 23. His opponent, former Lok Sabha Speaker Meira Kumar, is yet to file her papers.
If elected, Kovind will be the second Dalit president after K R Narayanan.