BORIS Johnson has refused to deny he had an affair with American businesswoman Jennifer Arcuri.

Last week the Prime Minister was referred to the police complaints body to assess whether he should face a criminal investigation over his links with Arcuri while he was mayor of London. 

The Greater London Authority (GLA) said its monitoring officer had recorded a "conduct matter" against Johnson over allegations Arcuri received favourable treatment because of her friendship with him while he was mayor.

The Sunday Times reported that the entrepreneur confided to four of her friends that they had been engaged in an affair during his time in City Hall.

The paper also reported that Arcuri had been given £126,000 in public money and privileged access to three foreign trade missions led by Johnson while he was mayor.

Speaking to Sky News earlier today, the Prime Minister refused to answer directly questions about whether he had an affair with Arcuri.

Watch the interview below.