Former US Vice President Joe Biden will hold his first event as a presidential candidate in Pittsburgh on Monday, speaking before union members whose endorsements may be key in the primary race.

Joe Biden to kick off US presidential bid with speech to union workers

This is President of the United States for you. A political novice, businessman and former fledgling real estate figure whose presidency has been filled with controversies, policy upheavals and high profile exits.

Donald Trump: US President marks another year of controversies

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Joe Biden to kick off US presidential bid with speech to union workers

Donald Trump: US President marks another year of controversies