ITV News has filmed an altercation outside the home of Liberal Democrat MP Mike Hancock, earlier today.
In a statement, a Hampshire police spokesman said: "A reporter received an injury to his nose during the incident.
"Police officers attended and are conducting an investigation into the circumstances surrounding the incident.
"A 37-year-old man has been arrested on suspicion of assault, and is being taken into custody where he will be interviewed by officers today."
Mr Hancock was suspended from the party yesterday following a report on alleged sexual impropriety.
More top news
Katie Price has defended using the n-word on live television after saying it twice on This Morning.
The 'obsessive and manipulative' stalker was found guilty of murder after his ex was found with cuts to her throat as deep as her spine.
A source close to the Labour leader ruled out his participation in any head-to-head debates which do not involve the Prime Minister.