James Murdoch, the youngest son of media mogul Rupert Murdoch, invested $100 million in his foundation, a large portion of which helped fund various political groups during the 2020 election.

James Murdoch and his wife, Kathryn Murdoch, made the donation through their foundation Quadrivium, according to the group's 2019 tax return, which was obtained by CNBC.

The donation came as the couple was establishing its own political relevance and marks the largest contribution to its foundation or any political effort, the news outlet noted.

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According to the tax document, more than $25 million of the $100 million donated went toward grants for several political causes, CNBC reported. Quadrivium also committed to donating more than $43 million to climate-related groups, and more than $38 million was spent funding election organizations, including some focused on protecting voting rights.

James and Kathryn Murdoch have previously supported causes that were nonpartisan or Democratic-leaning. Kathryn Murdoch has also been a vocal critic of former President TrumpDonald TrumpGuardian Angels founder Curtis Sliwa wins GOP primary in NYC mayor's race Garland dismisses broad review of politicization of DOJ under Trump Schumer vows next steps after 'ridiculous,' 'awful' GOP election bill filibuster MORE, knocking his handling of the coronavirus pandemic.

The couple also donated more than $20 million to President BidenJoe BidenBaltimore police chief calls for more 'boots on the ground' to handle crime wave Biden to deliver remarks at Sen. John Warner's funeral Garland dismisses broad review of politicization of DOJ under Trump MORE's 2020 presidential campaign and groups opposing Trump, among other issues.

The Murdoch family — which includes Rupert Murdoch and Lachlan Murdoch, James's brother and CEO of Fox — controls Fox Corp. and News Corp and is worth more than $22 billion, according to CNBC.