The future of the federal Coalition is in the balance this morning, after all 11 National party shadow ministers resigned from their positions yesterday.

Opposition Leader Sussan Ley says she urged the Nationals not to walk away from the Coalition, calling the resignations "unnecessary" and urging them to "reconsider".

Barnaby Joyce quit the Nationals in November, citing irreconcilably differences.

• GUEST: Barnaby Joyce, One Nation MP for New England.