Michael Bloomberg signals run for US presidency bbc.com

The ex-New York mayor files paperwork to take part in the Democratic primary election in Alabama.

Billionaire former New York City Mayor Michael Bloomberg has signaled he will join the race to secure the Democratic Party's nomination for US president.

He has filed paperwork ahead of a deadline for the Democratic primary election in Alabama.

The move is a necessary step to join the race to be the party's candidate to take on President Donald Trump in next year's election.