Billionaire investor George Soros has re-emerged this election cycle as a major Democratic donor, committing more than $25 million to Hillary Clinton and other party candidates and causes, according to Politico.

Soros spent roughly $27 million in a bid to unseat then-President George W. Bush in 2004 but later scaled back his giving, the website reported. Some associates of the Soros Fund Management chairman told Politico they expect him to give even more as Election Day approaches.

The Hungarian-born financier is worth $24.9 billion, according to Forbes' most recent estimate, and his return as a big-time contributor will be a boon to the party as it seeks to retain control of the White House and regain a majority in the Senate.

Soros advisor Michael Vachon told Politico that Soros "has been a consistent donor to Democratic causes, but this year the political stakes are exceptionally high."

Vachon confirmed to CNBC Politico's report of the roughly $25 million in donations so far this cycle.

Soros' charity, Open Society Foundations, did not respond to CNBC's requests for comment.

Read the full Politico article here.

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