The Sinn Fein leader added that he and his colleagues handed over the late Martin McGuinness's resignation letter, written when he stood down as Northern Ireland's deputy first minister in January.
Detractors of the pact include former Conservative prime minister John Major, who said it risked Westminster's neutrality in an ongoing and fragile process.
Sinn Fein, SDLP and the cross-community Alliance have all also already made clear that Northern Ireland Secretary James Brokenshire can not chair the ongoing process to restore power-sharing at Stormont due to a perceived conflict of interest caused by the deal.
The 1998 Good Friday Agreement - also referred to as the Belfast Agreement - commits the United Kingdom and Irish Governments to demonstrate "rigorous impartiality" in their dealings with the different political traditions in Northern Ireland.
Sinn Fein's Stormont leader Michelle O'Neill said: "I will be making it very clear that any deal between the Tories and the DUP can not be allowed to undermine the Good Friday and subsequent agreements".
"Progress will not come from a deal between the DUP and Tories to prop up a government in Westminster with an austerity and Brexit agenda but through the full implementation of the agreements and an Executive that respects the rights and delivers for all in society", she said.
What channel is the 2017 Congressional baseball game on? (TV, stream info)
On Thursday, the hospital reiterated that Scalise will need more operations and will be in the hospital "for some time". The practice was being held ahead of the annual Congressional Baseball Game , which raises money for charity.
"There is very little time left".
But a deadly fire at a tower block in London delayed the announcement of any deal. An agreement to restore devolved powersharing government in Stormont must be reached by the 29 June deadline.
"Northern Ireland's political leaders now have it in their hands to take control and shape a brighter future for everyone in Northern Ireland".
But an alliance between May and a pro-Union party like the DUP could undermine the confidence of Northern Ireland's Catholics in the process and revive tensions in an area bordering the EU.
However, the focus today is back to Brexit talks, which start on Monday 19th June and how Theresa May's deal with the DUP will affect the negotiations.
Theresa May's failure to win a majority at the General Election has led to suggestions her Brexit plan to leave the EU's Single Market and Customs Union could be altered, while rival parties have demanded involvement in exit talks following the inconclusive result.
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