03/25/2015 08:16 EDT | Updated 05/25/2015 05:59 EDT

ISIS fight: Rob Nicholson makes case to expand mission

Foreign Affairs Minister Rob Nicholson is providing more details today on what Canada has accomplished so far in the "global fight" against ISIS during a press briefing this morning.

- LIVE at 9 a.m. ET: Watch the ministers explain the military mission extension 

Prime Minister Stephen Harper laid out his proposal Tuesday to extend the current combat mission until March 31, 2016 during a speech to the House.

It would also give Canadian Forces authorization to mount airstrikes in Syria.

"As far as ISIS is concerned, there is no Iraq-Syria border," Defence Minister Jason Kenney told CBC News Network host Heather Hiscox on Wednesday morning.

But he stressed that Canada has "no interest in getting involved in the Syrian civil war, in any shape or form."

Kenney was initially slated to appear alongside Nicholson at the briefing, but his lectern was removed from the stage shortly before the briefing was set to begin.

Both the New Democrats and the Liberals have indicated they will vote against the motion, in part because they believe Canada should focus its efforts on humanitarian and diplomatic measures in the fight against the so-called Islamic State in Iraq and Syria.

No additional aid plans are expected to be revealed at today's briefing for journalists.

Later today, senior government officials will brief MPs during a closed-door session on Parliament Hill.

The motion is scheduled to be debated on Thursday.

Vote not required

Although the prime minister has made it a hallmark of his government to give MPs the opportunity to debate and vote on proposed military missions, parliamentary consent is not actually required to deploy Canadian troops. That authority rests exclusively with the executive, which exercises it on behalf of the Crown.

In an essay published last fall, University of Ottawa professor and defence expert Philippe Lagassé noted that such votes can be seen as a "courtesy" extended to MPs by the executive.

"The votes allow MPs to express themselves on a matter of national importance," he pointed out.

"In addition, they can be seen as a means of assuring the military that their mission has the support of the elected house of Parliament, and the votes add an aura of democratic legitimacy to controversial policy decisions."

But it can also provide political cover for the governing party, he adds.

"By laundering these decisions through the House, the government gives the impression that the Commons shares responsibility for the deployment."