Merkel said discussions at the July 7-8 gathering of world leaders in Hamburg would be difficult given Trump's climate scepticism and "America First" stance, but that she was determined to seek a clear commitment to the Paris accord against global warming and a pledge against protectionism.
When Trump announced in early June he would withdraw from the Paris deal, "we knew that we could not expect discussions to be easy" at the G20 summit, Merkel told the German parliament.
Without naming names, she also warned that "those who think that the problems of this world can be solved with isolationism or protectionism are terribly wrong" and pledged to seek a "clear signal for open markets and against sealing off" at the summit.
Trump's divergent stance has left Western allies struggling to find a common front for the G20 gathering -- unlike previous summits, when differences were drawn along global north-south and east-west lines.
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Even though Beijing has emerged as an ally in preaching free markets and climate protection, Merkel warned against unfettered Chinese economic expansionism.
"Europe must work hard to defend its influence and above all to speak with one voice to China," Merkel told business weekly WirtschaftsWoche.
"Seen from Beijing, Europe is more like an Asian peninsula. Obviously, we see things differently," she added.
"Merkel has called a summit between Europeans because there is a problem with the relationship with Trump," said a diplomatic source, speaking on condition of anonymity.
"It's necessary to ensure European cohesion because within the G20, it's complicated."
Besides the transatlantic differences, "there is also a new European division growing between east and west" particularly on the issue of refugees, noted Jean-Dominique Giuliani, president of the Fondation Robert Schuman, a Paris- based think-tank.
Trump's anti-immigration stance has emboldened many of the EU's ex-communist members in the east, which have staunchly opposed Merkel's pleas to accept larger shares of the refugees who have flocked to Europe.
European affairs journal Eurativ warned that "as some EU countries shun him and others welcome him with open arms, Trump could become the wedge that drives the Union apart".-
Even Merkel's European guests -- the leaders of G20 members France, Britain and Italy, as well as of invited countries the Netherlands, Spain and Norway -- have very different relationships with Trump.
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