Nicola Sturgeon has claimed there is "corruption at the heart of the Westminster system" and that it has to be rooted out following a sleaze scandal.
The First Minister has previously hit out at the Tories after former Northern Ireland secretary Owen Paterson resigned as an MP.
It came after he was found guilty by a Commons committee of lobbying.Earlier this week, former Attorney General Geoffrey Cox was slammed for using his parliamentary office for his second job offering legal advice.
He could face a parliamentary probe by C ommons standards tsar over claims he used his Westminster office to conduct private business.
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