Britain's representative on the EU executive in Brussels, Financial Services Commissioner Jonathan Hill, resigned on Saturday after having campaigned against a British exit from the European Union.
"I don't believe it is right that I should carry on as the British commissioner as though nothing had happened," Hill said in a statement.
European Commission President Jean-Claude Juncker said he had accepted Hill's decision with regret after failing to convince him to stay on. From July 16, the portfolio will be handled by Valdis Dombrovskis, the Latvian commissioner who, as vice-president for the euro, already oversaw Hill's brief. Hill had already faced calls in the EU parliament to give up the sensitive finance portfolio, which will be a focus of interest in exit negotiations between Brussels and London. He has had a key role in setting regulations that give Britain's huge banking sector access to euro zone markets.
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