The parliament had been due to meet again on November 5 to unveil the 2019 annual budget.
Ranil Wickremesinghe says he is prepared to leave the post of Prime Minister if he does not have the majority support of Parliament.
Rajapaksa and Sirisena's parties together have only 95 seats, short of majority in the 225-member house.
Mahinda Rajapaksa, who has formerly served as the President of Sri Lanka, on Friday took oath as the Prime Minister of the country in Colombo. First notice was on Wickremesinghe being removed as prime minister and the other on the appointment of Rajapaska as the new premier.
Earlier Sirisensa's United People's Freedom Alliance (UPFA) had said it would quit the ruling coalition, capping months of rising tensions between the president's bloc and Wickremesinghe's centre-right United National Party (UNP). "That's the democratic way to resolve this crisis", Perera said.
His reaction came shortly after President Maithripala Sirisena sacked Prime Minister Ranil Wickremesinghe and appointed his former foe Rajapakse as the new premier.
Since his rushed swearing in, Rajapakse is yet to announce the formation of a Cabinet - which under the Constitution is automatically dissolved when a prime minister is removed. The president has been critical of the prime Minister and his policies, especially on economy and security.
Sirisena won elections against Rajapakse in 2015 on a platform of economic reform and accountability for atrocities committed during his opponent's 10-year iron-fisted rule which saw the bloody end of Sri Lanka's brutal civil war. In April, Wickremesinghe successfully defeated a no trust motion in parliament engineered by Sirisena with backing from Rajapaksa.
The crisis will be prolonged if Rajapaksa can not swiftly demonstrate his command of parliament.
The sudden development came after Sirisena's broader political front United People's Freedom Alliance (UPFA) announced that it has made a decision to quit the current unity government with prime minister Ranil Wickremesinghe's United National Party (UNP). Several of Rajapakse's close family and associates face corruption prosecutions.
CBI feud: Alok Verma plea differs from government submission in 2017
Oct 26, 2018 - 04:31
The decision came following a bitter battle being fought between Verma and CBI's special director Rakesh Asthana . NDTV delivers reliable information across all platforms: TV, Internet and Mobile.
Broncos cut Chad Kelly after trespassing arrest
Oct 26, 2018 - 04:30
Kelly was drafted by the Broncos in the seventh and final round of the 2017 NFL Draft with the last pick, the so-called "Mr". He was kicked off the Clemson team in 2014 after arguing with coaches during the spring game.
Iran Accuses Saudi for Violating OPEC Pact Under US Pressure
Oct 26, 2018 - 04:29
On Tuesday, Zangeneh reiterated Iran's position that neither Saudi Arabia nor Russian Federation can replace Iranian oil. The WTI crude oil continues to trade bullish despite an unexpected rise in crude oil inventories last week.
Red Dead Redemption 2: Here’s When Reviews Will Start Being Published
Oct 26, 2018 - 02:39
A press release from Rockstar has confirmed the review embargo for Red Dead Redemption 2 will lift early tomorrow morning. Well, as with most open world games, it depends on what you want to do, and what you consider "complete".
Brewers react to NLCS Game 7 loss
Oct 24, 2018 - 04:02
But Taylor, who actually started the game at second base, showed off his incredible athleticism and versatility to make the catch. But the Dodgers quickly answered back, with Manny Machado's bunt single setting up Cody Bellinger's go-ahead two-run home run.
Questions and answers about state of the US-Mexico border
Oct 24, 2018 - 03:01
Homan said on Sunday that the option of military intervention to protect the border is one that needs to be on the table. Olivin Castellanos, 58, a mason from Honduras , took a raft across the river after Mexico blocked the bridge.
WATCH Paula Abdul Falls off Stage into Crowd During Concert
Oct 24, 2018 - 02:22
One such person is Paula Abdul who, if you weren't aware, is now crushing it on her Straight Up Paula! tour . Fans were audibly shocked after the fall, with one woman screaming after she went down.
Dozens injured after floor collapses at SC house party
Oct 24, 2018 - 00:41
Woodlands Property Management President Tal Slann told CNN that people fell through the floor into the basement. Attendees posted video of the collapse online, which features graphic footage and strong language.
Messi's injury shocks Barcelona
Oct 24, 2018 - 00:04
As Real Madrid are proving in the absence of Cristiano Ronaldo, a striker's goals are hard to replace but so too is the aura. Team doctors expect Messi to also be unavailable for three other games, including a visit to Inter next month.
Trump's missile treaty pullout as much about China as Russia
Oct 23, 2018 - 23:59
The only impact it had, he suggested, was to worsen relations between Moscow and Russian Federation . China also has a wide range of nuclear weapon delivery systems.
Police commando, photojournalist injured as protesters clash with cops; traffic restored
Oct 22, 2018 - 06:04
Video clips posted on the social media showed some people who had apparently seen the approaching train tried to run away. A state of mourning has been declared - offices and schools in Punjab will be closed on Saturday, Reuters reports.
No Mega Millions victor , jackpot climbs to $1.6 billion
Oct 22, 2018 - 05:25
The spike in the Mega Millions ticket price, from $1 to to $2, brought a major change to the starting amount. While they didn't win the grand prize, they were fortunate enough to walk home with $1 million.
Rob Gronkowski doesn't travel to Chicago, unlikely for Patriots
Oct 22, 2018 - 05:10
His biggest play in terms of the magnitude in the game, arguably, was his eye-popping 19-yard catch on a gutsy fourth-and-1 call. Given Gronkowski's importance to New England's offense, bettors began to hop on the Bears shortly after the news broke.
Black Ops 4 PC player counts have doubled over last year’s game
Oct 22, 2018 - 05:05
We've made a decision to roundup all the most current reviews from the major outlets in one spot for your reading pleasure. The Call of Duty game franchise might be 15 years old, but it's not showing any signs of a significant slowdown.
The Yellow iPhone XR Is Already in Short Supply
Oct 22, 2018 - 03:45
This is significantly lower than the XS and XS Max , and at par with the launch prices of last year's iPhone 8 and 8 Plus. The iPhone XR will cost R15,999 in South Africa for the 64GB version, iStore South Africa has announced .