May yesterday used a dinner at a Brussels summit of the 28-nation bloc to push her call for urgency on trade talks and get a deal she can sell at home in the British leader's latest attempt to reinvigorate the divorce talks.
"We must work together to get to an outcome we can stand behind and defend to our people," May told the leaders, who left less than fully convinced.
"We still have one-and-half years but we have to make haste," he added.
But since a conciliatory speech by May last month, EU officials have become increasingly impatient about a lack of detailed plans from Britain.
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German Chancellor Angela Merkel said May is making more of an effort with EU partners toward a Brexit deal, but it was "not enough."
Rutte agreed. "We will need more meat on the bone," he said.
Rutte was talking about the money that Britain will owe the EU for previous commitments it made once it leaves in March 2019. Estimates vary from 20 billion euros to 60 billion euros (USD 24 billion to USD 71 billion) or even more to settle commitments like long-term development projects or EU pensions.
Still, Rutte said providing a proper method to tally what Britain owes the EU might be good enough to allow leaders to call it "sufficient progress" so that talks could move to a second stage in December. "It is about trust, whether the negotiator has enough trust. If there are no concrete figures on the table, that there is a method which can lead to a result," Rutte said.
May had hoped that post-divorce issues like trade could be on the table starting next week.
She came with an olive branch in the form of a pledge to protect the EU citizens now in Britain after the nation leaves. The future status of the 3 million EU citizens living in Britain and the 1 million Britons living elsewhere in the bloc has been a main sticking point in negotiations.