From a meeting with King Charles III to a phone call with U.S. President Donald Trump, here's what to know about Burnham's first day at the helm of Downing Street.

On Monday, 56-year-old Andrew Murray Burnham of the Labour party, better known as just Andy, will become Britain’s 59th prime minister | India News

Andy Burnham begins his first full day as U.K. prime minister on Tuesday, after entering 10 Downing Street on a wave of enthusiasm and a mountain of challenges ahead.

The United Kingdom's new Prime Minister Andy Burnham delivers a speech outside 10 Downing Street in London after taking office on Monday. [Isabel Infantes / REUTERS]

The 56-year-old is the sixth prime minister to enter Downing Street in the last 10 years.

Andy Burnham is the UK’s new prime minister – here’s what he said in his first speech