Emotional David Littleproud steps down as leader of the National Party

A man in tie and shirt sleeves tightens his lips as a woman beside him holds his arm.

David Littleproud makes the announcement next to his wife, Amelia.  (ABC News: Matt Roberts)

In short: 

In an emotional media conference, David Littleproud has announced he will step down from the Nationals leadership.

The Queenslander says he is exhausted and it is time for somebody else to take over. 

What's next?

It is unclear who is likely to replace Mr Littleproud, with Nationals MPs caught by surprise.