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Nationals backbencher Colin Boyce said he will move a spill motion to challenge David Littleproud for the leadership of the party next week.

Mr Littleproud says he's "always respected" the party room's "decisions and direction", including "the right to voice different opinions" - and he stands by his record as Nationals leader. 

Meanwhile, pressure on Opposition Leader Sussan Ley has intensified.

The two most likely leadership contenders - Andrew Hastie and Angus Taylor - aren't ruling out a tilt ahead of parliament resuming next week.

Turning to WA where authorities have confirmed they're investigating the alleged throwing of a bomb into a crowd at an Invasion Day rally in Perth as a "potential terrorist act".

A 31-year old man has been charged with endangering lives or safety, and he's also been charged with making or possessing explosives under suspicious circumstances in connection with the Australia Day incident.

Overseas US President Donald Trump has signalled he wants to ease tensions in Minneapolis following the fatal shooting of American citizen Alex Pretti.

The killing of Mr Pretti has reignited local protests in Minneapolis and across the country, and comes just weeks after Renee Good was killed by an Immigration and Customs Enforcement official in the same city.Meanwhile a former senior lawyer says the latest investigation into the Minnesota governor and Minneapolis mayor is about shifting the focus of the events.