Karnataka plunged into a political crisis after 13 lawmakers resigned from the ruling coalition.

Even as Karnataka Chief Minister HD Kumaraswamy went into a huddle with the state coalition leaders in a last ditch attempt to save his 13-month old alliance government, hit by resignations of over a dozen Congress-Janata Dal Secular (JDS) lawmakers, disgruntled MLAs camped in Mumbai on Sunday made it clear they will not withdraw.

A day after the resignation of lawmakers rocked the coalition and plunged the state into a political crisis, leaders of both parties held day long discussions about the next course of action to save the government.

This comes even as opposition Bharatiya Janata Party said it is keeping a watch on the ongoing developments and indicated that the party was looking at options to form the government.

The Congress-JDS government has plunged into a crisis, with 13 MLAs of the alliance submitting their resignations to the Speaker so far - 12 of them on Saturday.

Nine Congress MLAs and three of JDS went to the Speaker's office to put in their papers on Saturday and later met Governor Vajubhai Vala at Raj Bhavan. Another Congress MLA, Anand Singh, submitted his resignation on July 1.

The ruling coalition, which has 118 MLAs in the 224-member assembly, faces the risk of losing its majority if the resignations are accepted.

Ten out of total 13 MLAs who have resigned are now camping at a hotel in Mumbai.

"We are 10 MLAs are here. In total 13 MLAs had submitted resignation to the Speaker and informed the Governor. All 13 of MLAs who have resigned are together and there is no question of us withdrawing our resignation," one among the MLAs who resigned, S T Somashekar, said in Mumbai.

Speaking to reporters, flanked by other MLAs who have resigned, he said, "Three more MLAs- Ramalinga Reddy, Munirathna and Anand Singh will join us tomorrow."

Congress leaders today protested outside the hotel there, accusing the BJP of luring away legislators of other parties.

Rocked by resignations of ten of its MLAs, Congress Legislature Party (CLP) leader Siddaramaiah has convened a meeting on Tuesday to discuss the developments and the assembly session, starting from July 12.

In an intimation to Congress MLAs, he has warned that their absence would be viewed "seriously".

The meeting gains significance amid reports that more legislators are likely to resign in the next couple of days.

To a question about attending the CLP meeting, Mr Somashekar said there was no question of them doing so as they had already submitted their resignations.

Asked whether they would withdraw their resignations if the Chief Minister is changed, he said "we have not asked for a change in CM, nor for someone else to be made CM."

There were reports of a change of guard as an option to save the government by making veteran Congress leader Mallikarjun Kharge the Chief Minister.

Mr Kharge ruled it out, saying "false" and "flimsy" news was being spread through the media just to divide the party.

"I don't know about it. I want this alliance government to continue and go smoothly," he said, adding he would also talk to the MLAs to withdraw their resignations He charged the BJP with trying to destabilize the "non BJP" elected governments across the country.

There were also reports that Siddaramaiah may be considered for Chief Minister if JDS agrees, to which JDS leader and Minister G T Devegowda said, "If the coordination committee decides Siddaramaiah should be the CM, we have no objection.. so be it."

HD Kumaraswamy, who arrived in Bengaluru on Sunday evening from the US, drove straight to a hotel where a JDS MLAs meet was being held.

Sources said he asked the MLAs to stay united against the BJP's "operation" and about ways to save the government.

He later held discussions with Congress leaders, including All India Congress Committee General Secretary KC Venugopal and Siddaramaiah, they said.

All options, including a cabinet reshuffle to make way for disgruntled MLAs, by asking some loyalists of both parties to resign from the Ministry, are likely to be discussed during Congress leaders' meeting with the Chief Minsiter, sources had said.

Congress leaders, including KC Venugopal who have camped in Bengaluru, held a series of meetings on Sunday to strategise the plan of action in a last ditch effort to save the government.

They also tried to reach out to MLAs who resigned and pacify them, sources said, adding efforts were also made to contact MLAs suspected to be "vulnerable" and who might resign in the days to come.

Siddaramaiah, Deputy Chief Minister G Parameshwara, Minister D K Shivakumar and Karnataka Pradesh Congress Committee Working President Eshwar Khandre were part of the meetings.

The Congress' high-command has reportedly questioned state unit leaders about how they had allowed such a large number of resignations to happen, party sources said.

They also specifically asked about resignations of Byrati Basavaraj (K R Puram), S T Somashekar (Yashwanthpur) and Munirathna (Rajarajeshwaringar), considered close to Siddaramaiah.

Meetings were also on in JDS circles, at the residence of party patriarch Deve Gowda.

D K Shivakumar, considered the Congress' troubleshooter, also met Deve Gowda at his home and and discussed the developments.

Stating that attempts are on pacify the MLAs, Siddaramaiah earlier in the day alleged that the BJP was behind it, using power and money as allurements to lure the disgruntled MLAs.

BJP state unit chief B S Yeddyurappa said the party was watching the developments and that they were not "sanyasis" to rule out the possibility of forming the government.

Ruling out the possibility of any mid-term polls, he said: "It has been just 13 months after the assembly election. We will not allow election to happen.

"Let them (Congress-JDS) give good administration. If they can't, we are there with strength of 105 MLAs... We will not meet the Governor or go to Delhi for now. We are watching the developments," he added.

The Congress-JDS coalition's total strength, including those who have resigned, is at 118 (Congress-78, JDS-37, Bahujan Samaj Party-1 and Independents-2), besides the Speaker.

The BJP has 105 MLAs in the House, where the half-way mark is 113. If the resignations are accepted, the coalition's tally will reduce to 105. The Speaker also has a vote.

Meanwhile, Congress and JDS workers protested in front of their party offices in Bengaluru, urging the MLAs to withdraw resignation.

In Mumbai, Congress leaders protested outside a hotel, accusing the BJP of luring legislators of other parties.