By Jack Elsom For Mailonline
Published: 13:07 GMT, 8 November 2019 | Updated: 13:51 GMT, 8 November 2019
The Conservatives have called on election officials to investigate the pact brokered between Remain parties.
An alliance between the Liberal Democrats, the Green Party and Wales' Plaid Cymru in 60 seats has shaken Boris Johnson's Tories who fear the agreement could deny them victories in marginal seats.
Tory Chairman James Cleverly has reportedly written to the Electoral Commission demanding the watchdog probes Unite To Remain - the third-party campaign group credited with forging the alliance - suggesting it could break spending laws.
Lib Dem leader Jo Swinson stands to gain the most from the Remain Alliance, with Green and Plaid Cymru stepping aside for her candidates in 43 seats
Liberal Democrats politician Heidi Allen speaks at a press conference announcing a Remain Alliance pact in London
In September he wrote: 'I would ask the Electoral Commission whether there has been a potential or pending breach of electoral law by the Unite to Remain organisation, and whether initial enforcement proceedings should be commenced to avoid a breach of the law in a regulated period.'
The watchdog then threw out the complaint on the basis that the UK was not in an election cycle.
But the Conservatives, who are desperate to win the December 12 poll to ram their Brexit deal through Parliament, have renewed their call for an investigation, according to the Telegraph.
Citing possible breaches of electoral law by 'coordinating resources', Mr Cleverly wrote: 'I urge you to urgently investigate the activities of Unite to Remain and ask what pre-emptive measures can be considered to prevent a potential serious breach of electoral law.'