• 24 July 2016
• From the sectionUS Election 2016

In remarks seen as attacking Republican presidential nominee Donald Trump, Mr Kaine also said the businessman had left "a trail of broken promises".

The 58-year-old moderate Democrat could appeal to Republicans who have been unsettled by Mr Trump's candidacy.

Mr Trump said Mrs Clinton and Mr Kaine "don't look presidential to me".

At the event in Florida, Mr Kaine recalled his time fighting housing discrimination as a young lawyer, saying: "If you want to be right, be a pessimist, if you want to do right, be an optimist. I like to do right."

Correspondents said Mr Kaine's comments were pitched to appeal to more left-leaning Democrats, who may have supported Mrs Clinton's one-time rival, Senator Bernie Sanders.

The Vermont senator had waged a strong campaign in the Democratic primary, championing liberal causes such as universal health care coverage.