Imran Khan will continue to be the Prime Minister of Pakistan until the appointment of a caretaker premier, according to a notification issued by President Arif Alvi on Monday.

The incumbent Prime Minister shall continue to hold office till appointment of the caretaker premier, the notification said.

President Alvi has also written a letter to Prime Minister Khan and Leader of the Opposition in the outgoing National Assembly Shehbaz Sharif, asking them to propose names of suitable persons for appointment as the caretaker premier, the Dawn newspaper reported.

The letter said that the National Assembly (NA) and the federal Cabinet had been dissolved on Sunday as per the Constitution.

Alvi told them in case they do not agree on the appointment within three days of the dissolution of the NA, they shall forward two nominees each to a committee to be constituted by the speaker, comprising eight members of the outgoing NA, or the Senate, or both, having equal representation from the treasury and the opposition, it said.

The members of that committee from the treasury and Opposition benches are to be nominated by the prime minister and the leader of the Opposition.

The Constitution has empowered the president to appoint a caretaker prime minister in consultation with the prime minister and the leader of the Opposition in the outgoing NA, the President's Secretariat said in a statement.

Meanwhile, Shehbaz said that he would not take part in the process and termed it "illegal", saying that the president and the prime minister had broken the law and questioned how they could approach the Opposition.

Reacting to Shehbaz's decision, outgoing information minister Fawad Chaudhry said: Pakistan is gearing up for the elections... Shehbaz has said he will not be a part of the process, that's his choice.

We have sent two names (to the president) today. If (Shehbaz) does not send the names within seven days, one of these will be finalised".

Earlier in the day, the Cabinet Secretariat issued a notification stating that Khan had "ceased to hold the office of the prime minister of Pakistan with immediate effect".

However, under Article 94 of the Constitution, the president "may ask the Prime Minister to continue to hold office until his successor enters upon the office of Prime Minister".

"Mr. Imran Ahmad Khan Niazi, shall continue as Prime Minister till the appointment of caretaker Prime Minister under Article 224 A (4) of the Constitution of the Islamic Republic of Pakistan," the President said on Twitter.

President Alvi had dissolved the NA on the advice of Prime Minister Khan, minutes after Deputy Speaker Qasim Suri rejected a no-confidence motion against the premier, who had effectively lost the majority in the 342-member lower house of Parliament.

Supreme Court Chief Justice Umar Ata Bandial, after taking a suo motu cognizance of the current political situation in the country, said that all orders and actions initiated by the prime minister and the president regarding the dissolution of the National Assembly will be subject to the court's order as he adjourned for one day the hearing of the high-profile case.

A three-member bench held the initial hearing despite the weekend and issued notices to all the respondents, including President Alvi and Deputy Speaker of the NA Suri.

The Supreme Court ordered all parties not to take any "unconstitutional" measures and adjourned the hearing until Monday.

Ahsan Bhoon, President, Supreme Court Bar, said that the action of the prime minister and deputy speaker was against the constitution and they should be prosecuted for treason under Article 6 of the constitution.

The crisis erupted after Suri rejected the no-confidence motion, providing Prime Minister Khan to send an advice to the president of the country to dissolve Parliament, which he could not do until any outcome of the no-confidence vote.

Leading constitutional lawyer Salman Akram Raja said that the entire procure by the deputy speaker and the advice by the premier to dissolve the assembly was unconstitutional .

Raja said the illegality of the ruling would also make the advice as illegal as the prime minister cannot give advice to the assembly after a no-confidence motion was presented in the parliament against him.