"It (JD-U, RJD alliance) won't affect the poll prospects of BJP and I am sure that the party will come to power in Bihar," he said.
"In democracy, everyone has a right to forge an alliance. But it will not have any impact on us," added the senior BJP leader and former Uttar Pradesh chief minister.
Congress has thrown its weight behind the Bihar Chief Minister, making it clear that while it would like a grand alliance of Lalu and Kumar, it would rally around the latter if an alliance between the two Bihar parties did not click.
Congress wants a broader umbrella alliance of RJD, JD(U), Congress, NCP, CPI-M and CPI to take on a resurgent BJP in the state.
Of the 243 Assembly seats in Bihar, JD-U had contested 141 in alliance with BJP and won 117 in the 2010 elections. RJD, on the other hand, had contested 168 seats in alliance with Ram Vilas Paswan's LJP and won only 24 seats.