Another day in federal Parliament, another politician who might be a dual citizen.

As the dual citizenship crisis has affected members of the Greens, the Government and One Nation, MPs have lined up to have a crack at those who have found themselves running afoul of section 44 of the constitution.

Turns out some of them should have listened to the old saying about glass houses and stones.

Here's all the times politicians' comments about dual citizenship came back to bite them:

The Government

We'll start with the man at the very top, the Prime Minister.

Malcolm Turnbull had a couple of digs at the Greens after it emerged that senators Scott Ludlam and Larissa Waters were dual-citizens.

"Obviously Senator Ludlam's oversight is a pretty remarkable one when you think about it — he's been in the Senate for so long," Mr Turnbull said.

In a separate interview with Channel Nine, the Prime Minister said:

"It is pretty amazing, isn't it, that you have had two out of nine Greens Senators didn't realise they were citizens of another country.

"It shows incredible sloppiness on their part. You know, when you nominate for Parliament, there is actually a question — you have got to address that Section 44 question and you've got to tick the box and confirm that you are not a citizen of another country.

"It is extraordinary negligence on their part."

And he wasn't the only member of the Government to join the pile-on.

Liberal senator James Patterson tweeted this at the time:

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What's happened since: First Resources Minister Matt Canavan quit Cabinet after discovering he might be a Italian citizen thanks to his mother. Then it emerged that Deputy Prime Minister Barnaby Joyce was a New Zealand citizen. Both cases have been referred to the High Court.

One Nation

Party leader Pauline Hanson was quick to comment when the Greens lost a second senator because of citizenship issues.

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As did her Queensland senator Malcolm Roberts, in a tweet some found offensive:

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What's happened since: After weeks of confusion, One Nation referred Senator Roberts to the High Court to determine if he is a dual British and Australian citizen.

So what about Labor?

The Opposition has so far found itself unscathed in the citizenship shenanigans gripping Parliament.

But there's no shortage of comments that might come back to bite them should one of their members be implicated.

Here's Opposition Leader Bill Shorten commenting on the Green's troubles:

"I think Australians will say 'what is going on with the Green political party? Are they ready to be serious political operators? Are they up for the job?' And so I think that this sort of inadvertently damages people's confidence."

And here's Manger of Opposition Business in the House Tony Burke today:

"Every member of the Labor caucus has been properly elected. We have processes in place, that go back to grandparents, making sure that wherever citizenship needs to be renounced, that the full requirements of the Constitution are taking into account."

"But the Prime Minister, remember his description of the Greens, when they first declared that they, the Green party, had made mistakes of this nature.

"He was talking of extraordinary recklessness on their part. How hopeless they were.

"Prime Minister, every criticism you made about the Green Party is now about you."

What was that about glass houses and stones again?