Peter Overby

Updated at 12:27 p.m. ET

Casino magnate Sheldon Adelson, one of the most prolific donors in conservative politics, died Monday night at the age of 87 due to complications from treatment for non-Hodgkin's lymphoma, according to a statement from Las Vegas Sands, the company he founded.

David Koch, who built one of the nation's largest private businesses with his brother Charles and pumped money into conservative groups to help reshape American politics, has died.

Charles Koch confirmed the news in a statement on Friday that referenced David's long-running ailment.

This story is published in partnership with The Center for Public Integrity

The headline posed a straightforward question: "Where is the Republican ActBlue?"

Very of the moment — except it was published more than a decade ago, during George W. Bush's administration.

Reform-minded Democrats have long held up "dark money" — political money that can't be traced to its source — as a symptom of what's wrong with politics in Washington. But while House Democrats this winter passed a bill to end the secrecy shielding donors behind unregulated dark money contributions, liberal activist groups now deploy those funds to boost the party's candidates in the 2020 elections.

Updated at 4:35 p.m. ET

White House lawyers communicated with the Treasury Department about how to handle House Democrats' request for President Trump's tax returns even before they made it, Treasury Secretary Steven Mnuchin said Tuesday.

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