The elder Byrne said in an interview last month that he regrets not supporting the campaign.

FORBES: Naked Short-Selling

At the moment he has not made a definite decision but has admitted he regrets the Olympic furore of last year when a newspaper claimed he would prefer to play for Team GB in Brazil.

BBC: Rory McIlroy: I may not play in Rio Olympics

After having its patience tested to the limit over the last few years, NATO now says it regrets having to use force to get the Bosnian Serbs to comply with demands.

CNN: The scene in Sarajevo