Boris Johnson has refused to say whether his father Stanley will be probed by the Tories after two women made claims of inappropriate touching.
The PM said it was 'absolutely right' women feel they can make complaints with confidence.
It comes after it emerged Stanley could be fired from a prestigious role as an environmental ambassador over the sexual assault allegations.
The powerful Conservative Environment Network, of which he is international ambassador, said: 'The alleged behaviour is not acceptable.'
The 81-year-old allegedly assaulted Conservative MP Caroline Nokes who said he had smacked her 'on the backside about as hard as he could' in 2003.
Her revelation earlier this week promoted political journalist Ailbhe Rea to come out and say he 'groped me'.
But as calls grew for a probe, a supporter of the 'charming' former MEP vowed it should not be a police matter if he was 'a little over-friendly, indeed handsy'.
The PM (pictured in Selby, North Yorkshire today) said it was 'absolutely right' women feel they can make complaints with confidence
It comes after it emerged Stanley (pictured in London yesterday) could be fired from a prestigious role as an environmental ambassador over the sexual assault allegations
Asked about the claims against his father, Mr Johnson said today: 'First of all, it's absolutely right that everybody, women in particular, should be able, have the confidence, to come forward and make complaints.'
The Prime Minister added: 'I'm obviously not going to comment on individual cases.'
He also declined during a visit to a Network Rail logistics hub near Selby, North Yorkshire, to say whether he has spoken to his father about the allegations.
Last night it emerged Stanley could lose his role as international ambassador of the Conservative Environment Network.
Yesterday in an excruciating exchange in the Commons, the PM found himself being grilled by MP Miss Nokes about government policy on sexual harassment.
She did not mention her own claims against his father, but asked Mr Johnson if women would have more confidence 'if public sexual harassment was a specific crime', and if early intervention might stop 'those harassing women becoming sex offenders?'
The 81-year-old allegedly assaulted Conservative MP Caroline Nokes (left) who said he had smacked her 'on the backside about as hard as he could'. Her revelation earlier this week promoted political journalist Ailbhe Rea (right) to come out and say he 'groped me'
Stanley ignored questions on the matter as he left his house in north west London yesterday.
He had previously told Sky News: 'I have no recollection of Caroline Nokes at all – but there you go.'
Labour has called for 'criminal
