The German leader reserved her most dramatic language for the Paris climate treaty after Trump pulled out of the global accord aimed at confronting climate change, which Merkel called "irreversible and not negotiable".
With regards to Britain's withdrawal from the EU, Merkel told German lawmakers in Parliament earlier in the day that the EU's priority was its own future.
Christiana Figueres, former executive secretary of the UN Framework Convention on Climate Change, said in a press teleconference on Wednesday that the European Union and China "might be able to deliver that [the joint climate statement] around the G20".
A major clash with the USA at next week's G20 Summit over its over its response to climate change is now all but inevitable, after German Chancellor Angela Merkel reiterated her determination to focus much of the talks on the issue.
"The differences are obvious and it would be dishonest to try to cover that up", she said. And the leader of the Christian Democratic Union made clear that she would not shy away from her objections when the two come face to face on July 7. "We can not wait to act until the science has convinced every last doubter". "Now we look forward to the chancellor's speech", Bahlsen said, according to Bloomberg News.
Emirates seeks laptop ban reprieve with new United States travel security measures
Commenting on the new challenging requirements, Kelly said: "We can not play global whack-a-mole with each new threat". These include a ban on electronic devices on their flights, or a total suspension of flights to the US.
President Donald Trump announced earlier this month that the USA would cease participation in the 2015 agreement to halt climate change.
Mr Macron added that "it is no use isolating a state".
Chancellor Merkel and President Trump will meet with their global counterparts at the G-20 summit in Hamburg.
Drawing a sharper, more general contrast between herself and Trump, Merkel said, "Whoever thinks that the problems of this world can be solved by protectionism and isolation lives under a huge misconception".
While the Chinese and European economies were increasingly intertwined, Merkel said, there remain points of contention about strategic industries and government procurement.