Following a week of scrutiny into his financial affairs, Cameron published details of the taxes he’s paid since 2009, after acknowledging that he sold about 30,000 pounds ($42,000) of shares in an offshore fund set up by his late father shortly before he became prime minister. He said he had paid all tax due on the sale.

Crackdown

Cameron will tell the House of Commons on Monday that companies will be prosecuted if they fail to stop their employees assisting tax evaders. He also set up a task-force of tax and law enforcement officials to pursue leads contained in the leaked documents.

“The real direct political risk is that Cameron is undermined as a pro-EU spokesperson among swing Labour voters, who without a word from their own party leadership might just vote ‘no’ in protest,” said Jacob Kierkegaard of the Peterson Institute of International Economics in Washington. “So the risk of ‘Brexit’ has increased.”

The leak from Mossack Fonseca to an international consortium of investigative journalists consisted of more than 11.5 million documents detailing over 214,000 offshore companies, about half of which are domiciled in the Virgin Islands.

Jeremy Corbyn, leader of the U.K.’s opposition Labour Party, said on Sunday that Britain had a role to play in cracking down on tax havens because many are British dependent territories.

“What Panama has shown more than anything is there’s one rule for the rich and another for the rest,” Corbyn said in an interview with the BBC. “We need to be much more assertive on overseas arrangements in British dependent territories.”

Fueling Populism

Iceland’s government survived a no-confidence vote on Saturday following the resignation of former Prime Minister Sigmundur David Gunnlaugsson over his offshore bank accounts. Malta’s government faces a parliamentary vote on Friday after the country’s energy minister and Prime Minister Joseph Muscat’s chief of staff were found to have trust companies domiciled in Panama.

“I doubt there will be further leader resignations beyond Iceland and perhaps some corporate executives,” said Peterson’s Kierkegaard. “These events fuel populism and undermine support for traditional parties.”