He said had the alliance with Goa Forward gone through, the Congress would have got majority in the state and that it was unfair to now make him a "villain".
He will meet Governor R L Bhatia on Tuesday morning and will be sworn in later in the day, CLP sources said.
The Janata Dal [Secular] is expected to make a last ditch effort to persuade the Congress to accept its demand that it should lead the coalition government with Siddaramaiah as the chief minister.
The speaker told Kumaraswamy that "this (SIT) should not lead to a witch-hunt. The probe should be only to establish the truth."
The by-elections are being held to fill the vacancies caused by the disqualification of 17 rebel Congress and Janata Dal-Secular MLAs, whose rebellion led to the collapse of the H D Kumaraswamy-led coalition government in July and paved the way for the BJP to come to power.
The CLP will meet at 11 am at Vidhan Bhavan, party spokesman Anant Gadgil said.
Kumaraswamy predicted that the political instability would continue in the state.
Ruling out any "operation" by the ruling alliance to poach the BJP MLAs, the chief minister said there was no necessity for it and that he was "relaxed."
The state has been in turmoil since the UDF ministry was downsized.
The governor has asked Deshmukh to be the caretaker chief minister till his successor in sworn in.
The team, comprising Vayalar Ravi, Pranab Mukherjee and Ghulam Nabi Azad, is right now meeting party legislators at Sahyadri Guesthouse at Malabar Hills.
Rahul is looking to bring new leadership in the state units that can bring in the young generation back into the party fold and revive its sagging image and morale. Renu Mittal reports
In the past the Congress had cold-shouldered overtures from the Samajwadi Party chief, leading to bad blood between the two parties.
According to data shared with the Lok Sabha, 19 road projects awarded after May 2014 were facing delays
Sonia Gandhi on Sunday hosted her first Iftar in three years, which saw the Congress president sharing a table with leaders of RJD and its new-found ally Janata Dal-United.
Janata Dal-United leader Nitish Kumar will take oath as chief minister of Bihar on February 22, ending weeks of political uncertainty in the state.
A majority of Congress leaders said the party will face desertions if Rahul Gandhi does not remain the leader.
Rane did not rule out the possibility of joining the BJP, saying 'all options are open'.
Congress leader Rahul Gandhi on Saturday termed Food Security Bill a "historic legislation" and asked party leaders to publicise its importance to masses as they gear up for elections scheduled early next year.
Assam Health and Education Minister Dr Himanta Sarma on Sunday met Chief Minister Tarun Gogoi and offered to resign from the Cabinet even as he said that the dissidence in the Congress Legislature Party had come to an end.
Unless the merger is reversed, the Congress is set to lose its Opposition Party status in the state assembly.
The coalition government is on a shaky wicket with 16 MLAs -- 13 of the Congress and three of the Janata Dal-Secular -- resigning their assembly membership. Besides, two independent legislators, who were made ministers recently to provide stability, have quit the ministry and withdrawn support.
Dissident Congress leader Kalikho Pul was on Friday night sworn in as chief minister of Arunachal Pradesh after more than two months of political crisis, shortly after the Supreme Court paved the way for government-formation and President's rule was lifted from the state.
Deve Gowda indicated on Sunday that they were ready to compromise.
Nagaraj reached Mumbai accompanied by Karnataka BJP president B S Yeddyurappa's personal assistant Santosh and BJP MLA R Ashok.
Congress has alleged a scam of Rs 45,000 crore in the allocation of mines in Rajasthan and demanded the immediate resignation of Chief Minister Vasundhara Raje along with a Supreme Court-monitored CBI probe into the matter.
She noted that the democracy was at peril under the Modi government and alleged that it was misusing and abusing its mandate in the "most dangerous" fashion, the sources said.
According to Congress sources, few ministers from the party have even offered to step down in the larger interest and to keep the coalition intact.
All India Congress Committee general secretary in-charge of Uttar Pradesh Ghulam Nabi Azad said the party would not react immediately and would come out with a detailed reaction in Lucknow on Sunday.
The anguish of the party MLAs seems to be directed at Digvijay Singh who has been handling the party affairs in Goa.
The truce, even if it is not permanence peace, will come under stress and test during the pending polls to rural local bodies in nine revenue districts and urban polls across the state, including those for 16 municipal corporations, starting with Chennai, the oldest and largest, says N Sathiya Moorthy.
The Supreme Court on Tuesday cleared the decks for oath taking of Manohar Parrikar as the chief minister of Goa by refusing the plea of Congress to stay the ceremony, saying the BJP has shown the support of 21 out of the 40 newly elected MLAs.
In a major exercise ahead of Lok Sabha polls, Congress on Thursday night constituted screening committees for all states and union territories for early selection of candidates.
The much talked about report of the AK Antony panel, which went into the reasons of worst-ever poll debacle of Congress, was today submitted to party President Sonia Gandhi.
As the House resumed its sitting an hour late, the Speaker made it clear, "The debate should start now. Everybody is watching us. Please don't make me a scapegoat. Let us reach our goal," stressing that the process should reach finality on Monday.
The nation on Thursday remembered Mahatma Gandhi on his 145th birth anniversary with Prime Minister Narendra Modi and other leaders paying floral tributes at his memorial in New Delhi.
Harish Rawat, a Union Minister, was on Saturday sworn in as the new chief minister of Uttarakhand, succeeding Vijay Bahuguna who was asked by the Congress high command to step down in a bid to boost the party's prospects ahead of the April-May Lok Sabha polls.
The Congress on Thursday downplayed a survey which projected major gains for the Aam Admi Party in big metropolises pushing Rahul Gandhi to third position as prime ministerial choice after Narendra Modi and Arvind Kejriwal, saying it will comment on its strategy at an appropriate time.
The confidence motion moved by Kumaraswamy was defeated with 99 members voting for the motion and 105 against it in a House of 225 including speaker P R Ramesh Kumar and a nominated member.