From PBS Frontline (USA). Just days after supporters of outgoing president Donald Trump smashed their way into the home of US democracy in a failed bid to halt the transfer of power, Joseph R Biden was sworn in as the 46th President of the United States. On Monday Four Corners brings you a political and personal portrait of the man now leading America. The program charts his rise from a hardscrabble childhood where he faced bullying and discrimination based on a severe stutter, to his discovery of the power of politics. Against the odds, he gained momentum and won the Presidency. Now he faces the huge task of uniting a bitterly divided nation.