The federal opposition is circulating a letter from the Egyptian embassy in Canberra that confirms Labor MP Anne Aly "completely renounced" her citizenship of the country on May 6, 2016, meaning she did not breach Section 44 of the Constitution.

Earlier on Friday the Labor MP was under pressure from her own leader Bill Shorten to provide documentation that proved she renounced Egyptian citizenship before the 2016 federal election.

The fresh doubts over Dr Aly's status were triggered by reports in the Australian, just days after parliament's ongoing dual-citizenship crisis triggered a fresh wave of resignations.

But by the middle of the day, Labor was circulating a newly-written letter from the Egyptian embassy - dated May 11.

"Dr Anne Aly renounced Egyptian citizenship on 6 May 2016 having completed all the steps required and as of that date had completely renounced her Egyptian citizenship," the letter reads.

"Nothing further needed to be done to make her renunciation effective."

Dr Aly said the original confirmation from the Egyptian embassy on May 6, 2016 was "verbal" over the phone, hence the need to request written proof on Friday.

"I rang them and said 'have you received my papers?' Yes. 'Are they all in order?' Yes," Dr Aly told reporters at Parliament House.

"It's not a relief, because I knew that that was the case," she said.

"I think it's more of a relief to Australians."

Dr Aly's documents uploaded to an online citizenship register only included a letter from the Egyptian embassy in Canberra dated July 2017, confirming Ms Aly made the “request” to “relinquish her Egyptian nationality” on May 4.

Labor leader Bill Shorten said he has spoken to the West Australian MP on Friday morning, asking her to double-check her status following media reports.

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“I've spoken to Ms Aly this morning,” Mr Shorten told reporters at a Canberra hospital.

“I've asked her to reconfirm the advice with the Egyptian embassy.”

“I think she'll have to make that public,” he said.

Prime Minister Malcolm Turnbull said Ms Aly should “provide some proof”.

The questions over Ms Aly’s status came at the end of a week that saw Labor senator Katy Gallagher ejected by the High Court for breaching the Constitution's now-infamous Section 44.

The Gallagher decision immediately triggered the resignations of three more Labor MPs and one Centre Alliance MP whose cases were considered legally similar.

Labor's Susan Lamb, Josh Wilson and Justine Keay all quit their lower house seats on Thursday. Ms Sharkie, from the renamed Xenophon group Centre Alliance, formally resigned on Friday morning.

They are now facing by-elections to be held in a "Super Saturday" poll as early as June 16.

Mr Shorten argues the by-elections are a battle between the coalition's corporate tax cuts and the opposition's plans for bigger personal income tax relief.