Morning top 5: Anti-Trump letter, Rio ticket touting and Belfast murder arrest

The top stories of the day on Newstalk.com

US presidential candidate Donald Trump is facing another revolt from within his own party.

A group of 50 Republican national security experts have signed an open letter saying the nominee "would be the most reckless president" in American history.

They say Mr Trump "lacks the character, values and experience" to be president.

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Police in Brazil believe they have dismantled a major international touting ring and have confiscated more than 1,000 high-value Olympic tickets.

An Irish executive of a British ticketing firm was among the suspects arrested on Friday.

Kevin James Mallon, who works for THG Sports, was detained in Rio de Janeiro along with another employee of the firm, the Civil Police said.

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Police in Northern Ireland have arrested a man in connection with the murder of leading loyalist John Boreland.

The 42-year-old suspect was arrested in north Belfast last night.

Mr Boreland, who was a member of the UDA, was shot near his home in the area on Sunday night.

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The leadership of the National Bus and Rail Union meets today to consider what form of industrial action will be taken at Dublin Bus.

NBRU members voted overwhelmingly in favour of strike action after rejecting an 8.25% pay rise recommended by the Labour Court.

The union had sought increases of up to 31% to bring drivers in line with wage terms secured by Luas drivers earlier this year. 

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Hundreds of people are expected at Saint Eugene's Cathedral in Derry today to pay their last respects to Bishop Edward Daly, who died yesterday.

Dr Daly famously waved a blood-stained white handkerchief as a symbol of ceasefire while trying to help John "Jackie" Duddy, a protester who was shot dead in Derry on Bloody Sunday in 1972.

A funeral mass for the 82-year-old will take place on Thursday.