May is due to meet the leaders of all five Northern Ireland political parties, June 15, in an effort to try and form a consensus over power-sharing, following the fallout between Sinn Fein and the DUP in January, when Sinn Fein's Martin McGuinness resigned as deputy First Minister, throwing the executive - the devolved government - into chaos.
The meetings came as time is running out for the parties to reach an agreement on restoring devolved government to Stormont, with the Government set to resume direct rule from Westminster if there is no deal by June 29.
The pact with the DUP had been expected to be sealed yesterday after the prime minister said she had made significant progress in talks.
The Conservatives are having to rely on the support of 10 DUP MPs after they fell eight seats short of winning an overall majority at the general election.
Mrs May stressed Brexit would happen and the timetable remains on course.
Ms O'Neill said: "We made very clear the the Prime Minister that any deal between herself and the DUP can not undermine the Good Friday Agreement, it can not undermine the joint nature of the office".
"We want to know what is in the deal they are offering to the DUP and we want to know when it is going to be put before Parliament", he said.
Gerry Adams has warnedTheresa May that her possible deal with the DUP is playing "fast and loose" with her government's commitment in the Good Friday agreement to be impartial.
Sinn Fein's Northern Irish Assembly leader Michelle O'Neill will be among the guests, and issued a statement flagging her concerns with May over a "confidence and supply" deal with the Democratic Unionist Party.
"We have worked as a party with the DUP before and those are productive talks".
However, the source added that a full deal on the government's programme wasn't required before the opening of Parliament, adding that there would be "steady dialogue" with the DUP.
"The SDLP are clear that any deal struck must not hinder cross-community confidence in our politics".
Details of the DUP's wishlist have been kept secret but it favours a "soft" Brexit and wants to avoid bringing back border controls between Northern Ireland and the Republic.
The DUP source told BBC assistant political editor Norman Smith the two parties were now finalising the "terms and conditions" of an agreement after Mrs May and DUP leader Arlene Foster met on Tuesday.
The 27-year-old, who is a California native, can sign a four-year, $130 million free-agent deal with Los Angeles next summer. The current CBA makes that contract only available to George under a narrow set of circumstances, and only from the Pacers.
The president complained the probe is unfair and wondered why his defeated Democratic opponent wasn't getting the same scrutiny. Friday's tweet marked the first time Mr Trump has publicly acknowledged he is under investigation.
When the members of the Republican team were announced, mention of Scalise's name drew a standing ovation throughout the stadium. Griner remained in the hospital in good condition after sustaining a gunshot wound to the ankle, according to a Friday update.
Madrid have been linked to a move for Monaco striker Kylian Mbappe and the evergreen Ronaldo may have a new partner next season. Kylian Mbappe enjoyed an incredible debut season in the Champions League .
As a result of the casualties, the separatists called for a protest shutdown and authorities imposed section 144 in south Kashmir. Some of the militants also fired from within the crowd indiscriminately on the security forces engaged in the encounter.
May's majority in parliament until the snap election was only held by 17 seats, but now she is at a considerable disadvantage. May said Brexit talks would begin on June 19 as scheduled, the same day the British parliament is due to reconvene.
At 24-19 down, Australia spent the majority of the last quarter of the game throwing everything at the stoic Scottish defence. Australia had a day to forget on Saturday as they went down 24-19 to Scotland in Sydney.
That left a jury to decide whether they believed Yanez on the witness stand, and they opted Friday to acquit the officer. Despite the acquittal, the city where Yanez works nearly immediately announced plans to dismiss him.
Mr Rosenstein had written a memo the White House used to justify the firing of Mr Comey, BBC reported . An official of Trump's transition confirmed the lawyer's internal order, which was sent Thursday.
The White House didn't immediately deny that notion but made clear that Ruddy was not speaking for Trump. Others pointed out that forming the PAC could be a sign of Pence's intent to run for higher office .
Trump tweet appears to confirm investigation
These included House Speaker Paul Ryan, and Republican senators John Thune, John McCain, Lindsey Graham and Susan Collins. Mueller serves at the will and pleasure of Deputy Attorney General Rod Rosenstein, who appointed him to head the inquiry.
London attack death toll rises to eight
The son's employer, HSBC, has provided the services of a private detective to aide in the hunt for information. Borough Market , a popular gathering place, remains closed as more evidence is gathered.
Justin Thomas shoots 63, trails Brian Harman by 1 at US Open
Next up is a weekend without most of the biggest names in golf . "You don't think you're going to shoot 7-under par at the U.S. First was this absurd putt on the 5th hole, where he lined up facing away from the hole and used the slope to sink a birdie.
Has Beyonce gone into labor?
Guests included pregnant tennis ace Serena Williams, and Beyonce's Destiny's Child bandmates Kelly Rowland and Michelle Williams. Last month, Beyonce's mum, Tina Lawson, revealed the star was excited about the imminent arrival of the little ones.
Rafael Nadal Wins Historic 10th French Open Title
That September, he was crowned US Open champion for the second time in his career following a four-set win over Djokovic . Nadal continued with his relentless hitting in the third set, either scoring winners or forcing errors from Wawrinka .
Will the NBA Champion Warriors Visit the White House?
Thompson, while relatively quiet, hit a couple of three-pointers to start the third quarter as the Warriors took a 79-66 lead. History has shown us that the numbers of superstars begin to trend in the wrong direction once they reach that magical age.
Beyonce and Jay Z 'thrilled' to welcome twins
And social media users have made a keen observation: Beyoncé's twins could be Gemini and Twitter is loving the coincidence . Jay Z was then spotted by the paparazzi rushing towards the LA hospital in his chauffeur-driven Escalade.
Syria troops advance in Raqa towards Deir Ezzor: monitor
A large number of ISIS terrorists, including non-Syrians, were killed and their military hardware were damaged in the attack. Su-35 and Su-34 jets were used in the strike, which was preceded by drone reconnaissance flights, the ministry said.
Florida Man Fights Off Armed Robbers With Machete
Four men, including Cabrera-Basulto and Jauregui-Lorente, wearing dark clothing were found inside the vehicle and arrested. Suspect Alen Beltran-Vasquez is charged with two counts of armed robbery and possession of a firearm by a convicted felon.
Low turnout so far in French parliamentary vote
Prime Minister Edouard Philippe, a center-right politician who joined Macron's movement, cast his ballot in the port of Le Havre. That would allow Macron to move fast with promised legislation, notably on changing labor laws to make hiring and firing easier.
Iraqi forces launch attack on Mosul old city
However, this has been treated with scepticism given he has frequently been reported killed or wounded over the last three years. Iraq state TV aired live footage showing thick black smoke rising from the Old City, with the sound of gunfire rattling inside.