Seven's Sunday Night program has released additional footage in a bid to defend its controversial interview with Barnaby Joyce and his former media advisor, and now partner, Vikki Campion.

Viewers criticised the current affairs program for failing to push the former deputy prime minister on the sexual misconduct allegations that came to light earlier this year. Some watchers were also furious that the Nationals MP wasn't asked about whether or not he misused his travel entitlements.

The previously unseen elements of the interview also included Ms Campion going into further detail about the social media abuse she had endured in the wake of the scandal being exposed.

While Campion discussed being called a "homewrecker" on Sunday evening's broadcast, she revealed vulgar slurs were also used against her such as "rent-a-root".