Russia - Yeltsin invitation to talks

President Boris Yeltsin is set to meet with key political figures at the 'Rus' residence, an unusual venue typically reserved for meetings with heads of state. This meeting, involving speakers of both houses and the acting Prime Minister Kiryenko, along with the head of the presidential administration, is seen as a response to the call from the Federation Council and State Duma to consult before voting on Kiryenko's candidacy.

Who is the acting Prime Minister mentioned in the text?

What was the purpose of inviting the mentioned politicians to the meeting?