Barnaby Joyce and partner Vikki Campion are expecting a second child, it has been reported.

The former Nationals leader and his ex-staffer have revealed the news to family and friends, The Courier-Mail reports.

It is understood the baby boy is due in June and will be named Thomas, after Mr Joyce’s grandfather.

Mr Joyce resigned as deputy prime minister and Nationals leader last February after revelations surfaced of his affair with Ms Campion.

The couple already have a baby son, Sebastian, and Mr Joyce has four daughters from his marriage with now-estranged wife Natalie.

Opposition Leader Bill Shorten congratulated Mr Joyce and his family.

“That’s entirely a personal matter for them and I congratulate them,” Mr Shorten told reporters in Queensland on Sunday.

“Whenever a child is to be born it is good news.”

Prime Minister Scott Morrison also offered his congratulations.