Ted Sampley, who fought with US Special Forces in Vietnam and is now a leading campaigner for veterans’ rights, said: ‘I have been following John McCain’s career for nearly 20 years. I know him personally. There is something wrong with this guy and let me tell you what it is – deceit.

‘When he came home and saw that Carol was not the beauty he left behind, he started running around on her almost right away. Everybody around him knew it.

‘Eventually he met Cindy and she was young and beautiful and very wealthy. At that point McCain just dumped Carol for something he thought was better.

‘This is a guy who makes such a big deal about his character. He has no character. He is a fake. If there was any character in that first marriage, it all belonged to Carol.’

One old friend of the McCains said: ‘Carol always insists she is not bitter, but I think that’s a defence mechanism. She also feels deeply in his debt because in return for her agreement to a divorce, he promised to pay for her medical care for the rest of her life.’