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Four Democratic senators want ExxonMobil to turn over any documents showing the company donated to a group that sent money to anti-climate change researchers, according to a letter sent Thursday.

Massachusetts Sens. Elizabeth Warren and Ed Markey, Rhode Island Sen. Sheldon Whitehouse and Connecticut Sen. Richard Blumenthal signed a letter to ExxonMobil CEO Rex Tillerson. The senators want Tillerson and ExxonMobil to turn over any evidence the company, its foundation or its affiliates donated, or matched employee donations, to Donors Trust and Donors Capital Fund.

Donors Trust and Donors Capital Fund began to support climate change denial groups in the mid-2000s, not long after ExxonMobil pulled its funding from the group. The letter says Donors Trust and Donors Capital Fund worked as a way for ExxonMobil to fund the research anonymously.

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