Sterling jumps at first on news of a deal, but falls back after the DUP reiterates its opposition.Read more
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The BBC's Jayne McCormack explains why the Democratic Unionist Party has so much power.
With an agreement reached with the EU, Boris Johnson now needs MPs to back it in Parliament.
In a video posted on her Instagram profile, Stella Creasy, the Labour and Co-operative MP for Walthamstow, said the deal is "worse" than Theresa May's deal.
She said: "It [Mr Johnson's deal] doesn't have a level playing field,essentially the consumer rights, the working protections, the environmental protections we've always had as being part of the European Union, that have made a big difference to our lives here at home.
"Keeping them means we can have a close trading relationship with the European Union.
"This is really the hardest of all Brexits he [the PM] is proposing."