By Gram Slattery

UNITED NATIONS (Reuters) -U.S. President Donald Trump will address the U.N. General Assembly on Tuesday as world leaders grapple with crises from Gaza to Ukraine and question whether the United States, with its “America First” foreign policy, is still prepared to play a leadership role in global affairs.

Since taking office in January, Trump has upended U.S. foreign policy, slashing foreign aid, imposing tariffs on friend and foe alike and cultivating warmer – if volatile – relations with Russia.

At the same time he has sought, so far with only limited success, to solve some of the world’s most intractable conflicts.

Some 150 heads of state or government are expected to address the chamber this week, including Trump, who is the second scheduled speaker after the sessio

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