The Speaker was monitoring the development and was keeping herself updated about the search and rescue operations, they said.
Kumar had met Khandu on April 28 during her visit to Itanagar to attend the 13th annual conference of the North East Region Commonwealth Parliamentary Association (NERCPA).
The fate of the Chief Minister, whose helicopter went missing shortly after take off from Tawang yesterday, is unknown even as the Army, SSB, ITBP and the state police have launched a massive ground operations to locate it.
Search teams from the neighbouring Bhutan have also launched rescue operation in seven districts of the country, sources said.
Union Ministers Mukul Wasnik and V Narayanswamy are on their way to Itanagar from New Delhi to monitor the search operations, official sources said.