Former US Secretary of State Hillary Clinton has formally entered the 2016 race for the White House in a bid to become the first woman US president.

She launched her campaign website on Sunday, telling Americans she wanted to be their "champion".

Mrs Clinton ran for the Democratic presidential nomination in 2008 but lost to Barack Obama.

The overwhelming Democratic favourite, she had been expected to declare her candidacy for months.

In a video on her website, Mrs Clinton declared: "I am running for president".

"Americans have fought their way back from tough economic times," she said, "but the deck is still stacked in favour of those at the top.

"Everyday Americans need a champion and I want to be that champion," she added.

(BBC)