With Trump due to attend the G-7 in France and later visit Poland, many are wondering why a stop-over with Angela Merkel in Berlin isn't on the list. Experts say the cold shoulder move is part of a wider strategy.
In her New Year speech, Merkel said she recognised that many Germans "bemoaned" the ruling coalition that took office in March, an alliance of her conservative bloc and the centre-left Social Democrats, which has been blighted by infighting.
Saudi Arabia, the United Arab Emirates, Egypt and Bahrain cut diplomatic and trade links with Qatar on June 5, accusing the world's biggest exporter of liquefied natural gas of financing terrorism and cozying up to their arch-rival Iran.
During the Mediterranean migrant crisis of 2015, hundreds of thousand of refugees arrived in the Balkans, Italy and Greece. That prompted the EU to impose mandatory quotas on its member countries for relocating asylum seekers.
In a tit-for-tat update to its own travel guidance, Turkey on Saturday warned citizens living in or travelling to Germany "to be cautious, taking into account the situation in Germany where they could risk xenophobic or racist treatment".
Two years since she opened Germany's borders to asylum seekers to avert what she says was a looming humanitarian disaster, and saw her popularity slide as a result, Merkel has climbed her way out of the deepest hole of her political career.