BRUSSELS — The president of the European Council warned on Jan. 31 that President Trump was a potential threat to the European Union, including the American leader’s bellicose pronouncements with major geopolitical challenges like Russian aggression, China’s assertiveness and international terrorism.
In a letter sent to European leaders, Donald Tusk, the council president, wrote that those factors and “worrying declarations by the new American administration all make our future highly unpredictable.” He appeared to question whether the United States would maintain its commitment to European security under Mr. Trump’s leadership.
