Liberal Democrat leader Sir Ed Davey issued the call after Nathan Gill was jailed.
There has been a call for an investigation into Russian interference in British politics after a former ally of Reform UK leader Nigel Farage was jailed for accepting bribes from associates of Vladimir Putin.
Nathan Gill, 52, a former leader of Reform UK in Wales, received £40,000 for making pro-Russian statements in the European Parliament.
The Old Bailey heard Gill was paid by Oleg Voloshyn, 44, an ex-Ukrainian MP, who was acting on behalf of Putin supporter Victor Medvedchuk, 71.
Gill was first elected to the European Parliament in 2014 for the United Kingdom Independence Party (Ukip) and later represented the Brexit Party until the UK left the EU in 2020 following the Brexit referendum.
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