WINNIPEG -- Liberal brass are moving to prevent a grassroots challenge to the government's restrictive assisted dying bill from hijacking the ruling party's first national convention since winning last fall's election.

Journalists were not allowed to attend a pre-convention meeting of the party's women's commission on Thursday, where commission policy chair Wendy Robbins unsuccessfully sought support for an emergency resolution calling for amendments to the government's proposed new law on medically assisted dying.

Indeed, journalists were forbidden from even entering the hallway outside the meeting room, although two reporters were inexplicably permitted to stroll into the room anyway.

The agenda for the convention, which gets underway formally Thursday evening and runs until Saturday, is dotted with other events that are closed to the media, including all policy workshops and a question and answer session on the one other potential source of controversy: a proposed new party constitution.

That marks a departure for the Liberals, who have never barred media from policy workshops in the past, and seems at odds with Prime Minister Justin Trudeau's promise of openness and transparency.

After the women's meeting, Robbins said her resolution -- which calls for a more permissive approach to assisted death -- failed to get majority support in the room after a couple of MPs spoke against it.

"They said, 'Everything's in order for (a final vote on the bill in the House of Commons on) Monday and don't get in the way and it's too late and it can't go back to committee,"' said Robbins, who emerged from the meeting in tears.

In essence, she said Liberals are being told: "Hold your nose and say yes (to the bill)."

Nevertheless, Robbins remained undeterred.

She has more than the required 10 signatures backing her emergency resolution and still intends to submit it to the party's national policy committee, which has sole discretion to decide whether to reject it or allow it to proceed to the convention floor.

However, it's questionable whether the committee will accept the resolution. After the women's meeting, Robbins said national policy chair Maryanne Kampouris informed her that an emergency resolution must come from a sponsoring body, like the women's commission, even though the rules do not specify that requirement.

Robbins' resolution urges the government to drop the bill's restrictive eligibility criteria and adopt instead the more permissive criteria set out by the Supreme Court when it struck down the ban on assisted dying last year.

And it urges the government to allow advance requests for medical assistance in dying.

"Many of us are saying better no legislation than bad legislation," Robbins said in an interview before the women's meeting.

Health Minister Jane Philpott declined to comment on the resolution, which she said she hadn't read. But she said she welcomes any debate on the "important bill."

Robbins got some backing from former prime minister Paul Martin, who said the emergency resolution should be debated, if that's what delegates want.

"I would be in favour," he said. "It is a very difficult subject on both sides for many of us and I think that the more we can debate it, the better it is."

The government is scrambling to enact its new law on assisted dying by June 6, when the ban on medically assisted death will be formally lifted, in accordance with last year's landmark Supreme Court's ruling.

But Martin said it's "important that we get it right and that we don't be bound by arbitrary timelines."

Not all Liberals welcome more debate on the issue, however. Robbins said she's come under "a certain amount of pressure" from senior Liberals to withdraw the resolution in the interests of demonstrating a united front behind the fledgling government's first important piece of legislation.

"They really don't want grassroots Liberals to embarrass them."

From the government's perspective, a debate over the assisted dying bill would mar what was otherwise shaping up to be a celebratory post-election convention undisturbed by controversy.

Bill C-14 would make assisted death available only for clearly consenting adults "in an advanced stage of irreversible decline" from a serious and incurable disease, illness or disability and for whom natural death is "reasonably foreseeable."

That's considerably more restrictive than the criteria set out by the Supreme Court, which ruled that consenting adults with "grievous and irremediable" medical conditions who are enduring suffering that is intolerable to them have the right to seek medical help to end their lives.

Until Robbins' resolution, the biggest item on the convention agenda was a proposal to overhaul the party constitution to, among other things, do away with the concept of membership, giving anyone willing to register as a Liberal the opportunity to vote in leadership and nomination contests, attend conventions and take part in policy development.

Some rank and file Liberals have mounted a campaign to reject the proposed new constitution, which they fear would give too much discretion to party brass to run the party as they see fit.