Michael Brown was sentenced in his absence to seven years in jail in 2008 after he was convicted of fraud. Four former clients, including an ex-chairman of Manchester United football club, had accused the Briton of duping them out of about 40 million pounds ($65 million).

Brown was arrested in the Dominican Republic in January and deported to Madrid, Spain, on Saturday.

City of London police said Sunday that they will now seek a warrant to bring him back to Britain as soon as possible.

Brown donated about 2.4 million pounds to fund the 2005 national election campaign of Britain’s Liberal Democrats, the third-ranked party’s largest ever donation.