Peter Overby

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.

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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.

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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.

A new lawsuit by Sen. Ted Cruz, R-Texas, targets an obscure provision of campaign finance law.

At issue is loophole-closing language that restricts how much money lawmakers can accept from donors after Election Day as they seek to recoup loans they made to their campaigns.

The 2002 McCain-Feingold campaign finance law puts a $250,000 limit on payments from postelection donors, even if the candidate lent more, and there's a 20-day deadline for donors to contribute. Cruz is suing the Federal Election Commission as enforcer of the provision.

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