Leaders have begun a final day of talks at the G20 meeting in Hamburg as officials try to bridge the gap with the US on issues such as trade and climate change.
German Chancellor Angela Merkel, who is hosting the summit in Hamburg, said the talks so far had been “very difficult”.
Negotiators worked through the night in an attempt to reach a compromise on the wording of the final summit statement.
It comes after a second night of violent protests on Hamburg’s streets.
The G20 (Group of Twenty) is a summit for 19 countries, both developed and developing, plus the EU.
US President Donald Trump, who met UK Prime Minister Theresa May on Saturday morning, that he expected a “very powerful” trade deal between the two countries “very quickly”.
Trump: UK-US trade deal to happen quickly
On Friday, Mr Trump used his first meeting with Russian President Vladimir Putin on the sidelines of the G20 to discuss the alleged Russian hacking of last year’s US presidential election.
What about those ‘difficult’ issues?
Leaders at the summit are struggling to find common ground with the US following President Donald Trump’s decision to withdraw from the Paris climate agreement last month.
One unresolved section of the G20 communique is linked to the US desire to have a reference to fossil fuels – according to reports quoting unnamed EU officials.
A separate issue is Mr Trump’s rejection of free trade – although the president has said that he is not opposed to trade in principle, his position is that any trade deals agreed have to protect US industry.
Mrs Merkel said on Friday: “The discussions are very difficult, I don’t want to talk around that.”
She added that she hoped that the differences with the US would not affect the commitments made by other nations.