Margaret Ferrier has been accused of having a "brass neck" after her House of Commons suspension ended.
She is now allowed to return to the Commons after MPs voted for the privileges committee's recommendation that she be temporarily banned from the house for breaking Covid rules.
Ferrier, who sat as an SNP MP before losing the party whip in 2020, has repeatedly refused to resign despite facing calls to do so from both Nicola Sturgeon and Humza Yousaf.
Labour said Ferrier was "without shame whatsoever" and accused her of "drawing out a process that leave her constituents in limbo".
The Rutherglen and Hamilton West MP is currently facing a recall petition. If 10 per cent of her constituents sign it, a by-election will be called.
Labour is confident of winning back a seat which the party held between 2017 and 2019.
Labour shadow Scottish Secretary Ian Murray said: “Margaret Ferrier is apparently without shame whatsoever.
“She broke the law, has been suspended as an MP, and is now being dragged through the recall process where her constituents finally have the opportunity to kick her out for good.
"She has a brass neck to be in parliament when she’s drawing out a process that leave her constituents in limbo.
“The people of Rutherglen and Hamilton West can sign the recall petition and get the opportunity to elect a local representative in Michael Shanks who will diligently serve his community in Parliament.”
Ferrier lost the SNP whip and received a criminal conviction after travelling from London to Glasgow by train while infected with Covid at the height of the pandemic.
She was found to have travelled from Scotland to Westminster after testing for Covid in September 2020 and went on to speak in the House of Commons while waiting for the results.
After the test confirmed she was positive for the virus the MP still decided to take the train back to Scotland.
But Ferrier has urged voters in her constituency not to sign the recall petition - claiming her record "speaks for itself".
The recall petition opened on June 20 and will close at 5pm on July 31. Both Labour and the SNP have been campaigning in favour of it.
But Alba has been strongly against it, with MPs Neale Hanvey and Kenny MacAskill siding with Boris Johnson-supporting Tories in an attempt to vote down Ferrier's suspension last month.
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