Prime Minister Theresa May secured a last-minute deal with the European Union yesterday on phase one of Brexit negotiations. But while she managed to resolve issues that had seemed potentially insurmountable just days earlier — and get her own Conservative Party, Northern Irish hardliners, Ireland, and the E.U all to sign off — the next steps could be even dicier.
What's next: The negotiations now move onto phase two, centered around the future of the U.K.-E.U. trade relationship. That issue makes up the very core of Brexit, and it's set to tear open fault lines between British politicians — even within May's own Cabinet — who have competing views of how far Brexit should ultimately go.