Obama sharpens Brexit warning as leaves for Germany
Air Force One landed in the northern city of Hanover to a ceremonial guard welcome as a short burst of hail hit before giving way to bright sunshine.
The US president will hold talks with Merkel on what is Obama's fifth and last official visit to Germany.
The two leaders are then set to open what is billed as the world's largest industrial technology fair.
EU-US trade deal 'will fail' if US refuses concessions: German minister
Obama's trip will wrap up Monday with a keynote speech in which he is expected to frame his vision of transatlantic relations, and a meeting with Merkel as well as the leaders of Britain, France and Italy.
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