Almost 150 leaders from the American tech sector have published an open letter criticising Donald Trump's candidacy for US president.

Apple co-founder Steve Wozniak and Wikipedia founder Jimmy Wales are some of the people to have signed the letter, although the signees stress they have endorsed the letter at a personal capacity.

They write: "We believe in an inclusive country that fosters opportunity, creativity and a level playing field. Donald Trump does not. He campaigns on anger, bigotry, fear of new ideas and new people, and a fundamental belief that America is weak and in decline."

Describing Mr Trump's candidacy as 'divisive', the tech leaders say they want "a candidate who embraces the ideals that built America’s technology industry: freedom of expression, openness to newcomers, equality of opportunity , public investments in research and infrastructure, and respect for the rule of law.

"We embrace an optimistic vision for a more inclusive country, where American innovation continues to fuel opportunity, prosperity and leadership," they conclude.

The letter comes amid increased speculation over Mr Trump's running mate, who is due to be officially announced tomorrow.

A number of media outlets, including The Guardian, have reported that Indiana governor Mike Pence is likely to be named as the presumptive Republican candidate's choice for vice-president.

Mr Pence - who The Guardian describes as 'staunchly conservative' - is also a former congressman and radio host.

However, the New York Times reports that Mr Trump has also held meetings with a number of other potential running mates, including Trump's former rival for the Republican candidacy Chris Christie and former House Speaker Newt Gingrich.