Chancellor Angela Merkel. (1
Merkel comes with appointments that refer to two crucial questions. Trump made May 12 his election victory to decide whether to pull the United States out of the Iranian nuclear deal. Meanwhile, a European exception to Trump's steel and aluminum tariffs expires from 1 May until next Tuesday.
But there are few signs Merkel can withdraw Trump from decisions he sees as part of his populist pledge to help American workers and better secure international agreements
And for Trump, Germany's late refusal to join the Allied air strike to join Syria, the last on a list of complaints that include what he calls grossly unfair treatment of American automakers.
"I don & # 39; I think we should raise the bar of expectations," said Peter Beyer, coordinator of transatlantic relations for Merkel's Conservative Christian Democratic Union.
Merkel will not get the kind of flourish that came out of French President Emmanuel Macron's state visit earlier this week, and there will not be golf in the Florida sun when Trump hosted Japanese Prime Minister Shinzo Abe last week  Trump has a welcome gift Merkel: Confirmation of the Thursday of a US ambassador in Germany after months of delay.
Ric Grenell was nominated last year for a post considered crucial to US diplomacy. Although Trump blamed the democrat's political gambling for a long time, many saw in Germany and elsewhere that Trump had weakened US relations to become Europe's most populous country.
Merkel and Trump have little personal chemistry and talk less frequently than any American and German leaders in recent memory. Until a call in March, the two leaders went five months without direct communication.
Former President Barack Obama was in contact with Merkel weekly during much of his presidency, and his government considered it the central figure in European financial and political stability
Grenell's confirmation vote was made this week by Senate Majority Leader Mitch McConnell rushed to stop Merkel's first visit to Trump White House.
Grenell shares Trump's deep skepticism about the Iran deal it "a direct blow to the credibility of the UN" and the negotiations that resulted in "a colossal and dangerous waste of time."
Macron emphasized this week during his own meeting with Trump in Washington. The French President was the designated envoy for the European argument that the deal could be supported by complementary agreements. But before he left the city, he prophesied that the American president would nevertheless choose to retire.
Beyer said Merkel would try to convince Trump that "there is no plan B. If the US is out, then this thing is probably dead."
Trading will also be the focus of Merkel's pitch against Trump. The Chancellor pushed for a permanent European exception to the rates announced last month of 25 percent for steel and 10 percent for aluminum. She has rejected Trump's proposal for a bilateral US-German free trade agreement in favor of EU negotiations Trump despises
German newspapers reported Thursday that the government is preparing for tariffs as early as next week – a development that officials (19659018) "For Germans are trade the lifeblood of the country, "said JD Bindenagel, director of the Center for International Security and Governance at the University of Bonn and a former US diplomat. "The point that Merkel will try to make Trump is that by introducing tariffs on aluminum and steel you are harming your own industries."
The European Union has threatened retaliatory tariffs for American products like bourbon, cranberries and motorcycles and blue jeans.
Trump in turn has threatened a tax on German car imports.
"If you want to build cars in the world, then I wish you well, you can build cars for the United States, but for every car that comes to the US, you pay 35 percent tax," he said a January interview with the German newspaper Bild.
63-year-old Merkel – who recently began her fourth term as German Chancellor – is her third American president.
Unlike Macron and British Prime Minister Theresa May, Merkel refused to flatter Trump to win his favor. Germany was a frequent target of Trump's digs on Twitter. Merkel largely ignored his remarks and kept the president at a distance.
"She's very careful, he's cheeky, there's more conflict than consensus in this relationship," said Bindenagel.
Trump's approval ratings in Germany are miserable. A recent survey found that only 11 percent of Germans have confidence in the US president. When Barack Obama left office, the figure was over 80.
Merkel is now relatively popular in the United States and Germany, and more than half of voters agree with it in both countries.
How Merkel Expresses In Iran and in trade, the Germans are prepared for Trump to push back German defense spending and the Russia-directed Nord Stream 2 gas pipeline.
Trump has mocked Germany for failing to deliver NATO's target of spending two percent of its gross domestic product on defense. Germany remains at 1.2 percent, only moderate increases are planned and no clear strategy for achieving the goal. In the face of German history, many heads of state and government and their European neighbors were reluctant to make the country an important military force.
The gas pipeline has now become another wedge in US-German relations. A Russian-led consortium plans to build the pipeline to Germany along the Baltic Sea by the end of next year.
Trump was a vociferous critic, and Congressional leaders argue that the pipeline will increase Russia's energy dependency on Russia. Merkel, who expresses certain reservations, seems unwilling to block them.
Trump, said Beyer, "has respect for Merkel."
When asked if Merkel respects Trump, Beyer only indirectly replied: "The office he occupies is something everyone should have respect for."
Gearan reported from Washington. Luisa Beck in Berlin and Karoun Demirjian in Washington contributed to this report from Berlin.