Pakistan's president on Sunday dissolved the National Assembly on the advice of Prime Minister Imran Khan, foiling an attempt by the opposition to boot Khan from office.

"The President of Pakistan, Dr. Arif Alvi, has approved the advice of the Prime Minister," a statement from his office said, meaning fresh elections must be held within 90 days.

Fresh elections in Pakistan will be held in 90 days, State Minister for Information Farrukh Habib said Sunday. Habib announced in a tweet, although a final decision will come from the Pakistani president and the election commission.

Earlier, in an unexpected move, Prime Minister Imran Khan said he had sent advice to the president to dissolve the country’s parliament and called for fresh elections.

The move came minutes after the deputy speaker of the parliament "rejected" a no-trust motion against the prime minister, terming it "unconstitutional."

The combined opposition, led by the Pakistan People’s Party (PPP) and Pakistan Muslim League-Nawaz (PML-N), had submitted the no-confidence motion against Khan on March 8, contending that the prime minister had lost the trust of the majority of lawmakers.

"I congratulate the whole nation for this victory. The deputy speaker has rejected the opposition's no-trust motion against the government, which was at the behest of the foreign power," Khan said in a brief address to the nation.

"I have sent advice to the president to dissolve the assemblies and call for fresh elections," he said.

"Let the people decide who do they want in power. It's not the authority of the foreign power to decide that," he added.

It's, however, still unclear whether only the lower house of the parliament – the National Assembly – will be dissolved or the four provincial assemblies will meet the same fate.

Earlier, Qasim Suri, the deputy speaker, ruled that the opposition's motion is "in contravention of the constitution" as a "foreign power" is behind this move. Therefore, he further ruled that the voting on the no-trust motion scheduled for Sunday cannot be held.

The development came minutes after the high voltage session of the National Assembly began in the capital Islamabad, which was earlier scheduled to hold voting on the motion Sunday.

As soon as the session began, Information Minister Fawad Chaudhry, who also holds the additional portfolio of law minister, rose to his seat and sought the deputy speaker's ruling over the "constitutional authenticity" of the opposition's no-trust motion.

Accepting Chaudhry's contention, Suri "rejected" the motion terming it against the rules and regulations of the Assembly and the constitution.

Terming the prime minister's move "unconstitutional," opposition leader Shehbaz Sharif said both Khan and the deputy speaker would be tried for "high treason." The two, according to him, have acted against the constitution.

He said the opposition is approaching the Supreme Court against Khan's "unconstitutional" act.

In a related development, voting for the election of the new chief minister of Punjab could not be held amid the pandemonium.