Lambie, who first entered the senate in 2013 as a member of Clive Palmer's Palmer United Party, left, and was re-elected as an independent senator previous year.
Last week, questions started over Senator Lambie's status after a report revealed her father was born in Scotland.
Jacqui Lambie, an independent senator for the island state of Tasmania, confirmed that she is a dual United Kingdom citizen and that she will officially resign from parliament later on Tuesday.
But today it's been reported she has sought urgent advice from British authorities and, according to Fairfax, could hand in her resignation within 24 hours.
Jacqui Lambie, whose father was born in Scotland, told colleagues she will leave Parliament.
At the time, Senator Lambie said she was proud of her Scottish heritage, and had learned more about her father's family history in recent weeks while researching her forthcoming autobiography. Former Senate President Stephen Parry, One Nation's Malcolm Roberts, Greens Scott Ludlam and Larissa Waters, and Nick Xenophon were all forced out after being found to be dual citizens.
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The resolution requires MPs with dual citizenships to provide details and evidence of the date and manner of renunciation.
Government backbencher John Alexander resigned on the weekend because he is a dual UK-Australian citizen, but he'll contest a by-election for his old seat of Bennelong on December 16.
'I'm happy to put on record that I'm satisfied that my parents are both Australian citizens and I have no concerns about me being a dual citizen because of where they were born or came from'.
As with the other recently disqualified senators, Senator Lambie's position would normally go to the next person on her Jacqui Lambie Network ticket in the 2016 election, following a recount.
The Tasmanian senator announced this morning that she will resign from the Senate at midday after discovering she's a dual citizen.
Her replacement in the Senate will be determined by the High Court.
The two major parties have only today struck a deal on how to deal with MP's citizenship disclosures.