NYT:

Two of the Democratic Party’s most loyal constituencies, labor and environmentalists, are clashing over an effort to raise tens of millions of dollars for an ambitious voter turnout operation aimed at defeating Donald J. Trump in the November election.

The rift developed after some in the labor movement, whose cash flow has dwindled and whose political clout has been increasingly imperiled, announced a partnership last week with a wealthy environmentalist, Tom Steyer, to help bankroll a new fund dedicated to electing Democrats.