"Time has been sought from Rashtrapati Bhawan on February 11," JD(U) General Secretary K C Tyagi told PTI.
Kumar and other senior leaders would meet the president to press for opportunity to form government in Bihar, he said.
All the 130 MLAs belonging to JD(U), RJD, Congress, one CPI and an Independent would accompany Kumar to Rashtrapati Bhawan to be present before the president, said Tyagi, who has reached Delhi and is holding fort there.
It had also happened when opportunity was denied to Kalyan Singh in Uttar Pradesh and N T Rama Rao in Andhra Pradesh, he added.
Highly placed sources in Nitish Kumar's office said if no word from Raj Bhawan comes by tomorrow noon, he along with the 130 supporting MLAs might rush to Delhi.