What do AI mogul Sam Altman, Democratic Party firebrand Bernie Sanders and Donald Trump all have in common? All three want the public to have a stake in the AI boom.

What they cannot agree on is how much.

The OpenAI chief executive met the Vermont senator in his Senate office last week at Altman's own request to discuss Sanders' proposal that the public take a 50% ownership stake in AI companies such as OpenAI, with the proceeds used to create a public wealth fund.

Altman told Sanders he supported the general principle but could not back the 50% threshold, according to people with knowledge of the conversation, reported by AP.

The debate is no longer confined to Washington. Just days ago, the European Commission unveiled a proposal that could constitute its most sweeping attempt yet to wrestle back control of the technologies shaping the continent's future.