White House hopefuls Julián Castro and Tom Steyer Tom SteyerTV ads favored Biden 2-1 in past month Inslee calls Biden climate plan 'perfect for the moment' OVERNIGHT ENERGY: Trump administration finalizes plan to open up Alaska wildlife refuge to drilling | California finalizes fuel efficiency deal with five automakers, undercutting Trump | Democrats use vulnerable GOP senators to get rare win on environment MORE on Monday signed a pledge to oppose the Keystone XL pipeline, joining three other 2020 contenders in doing so.

Washington Gov. Jay Inslee Jay Robert InsleeBarr asked prosecutors to explore charging Seattle mayor over protest zone: report Bottom line Oregon senator says Trump's blame on 'forest management' for wildfires is 'just a big and devastating lie' MORE (D) and Sens. Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.) and Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.) have already signed on to the pledge from Bold Nebraska, which was launched last week.

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The pledge calls for candidates to promise to "revoke the existing presidential permits issued unilaterally by President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE for the Keystone XL and Dakota Access pipelines, sending both projects back to relevant federal agencies to undergo legitimate environmental review and Tribal consultations."

It also calls for the president to direct federal agencies to submit both pipelines to a "true climate test," to protect farmers from eminent domain abuse and to respect U.S. treaties signed with tribal nations.

"The KXL & DAPL pipelines were approved by Trump without consent of Tribal Nations or thought of climate change," Castro, the former secretary of Housing and Urban Development, tweeted Monday, shortly before speaking at the Frank LaMere Native American Presidential Forum in Sioux City, Iowa.

"I'm standing with tribal nations, farmers, ranchers, and environmental groups like @BoldNebraska, @IENearth, @MN_350, & @HonorTheEarth and taking the #NoKXLpledge."

The KXL & DAPL pipelines were approved by Trump without consent of Tribal Nations or thought of climate change.



I'm standing with tribal nations, farmers, ranchers, and environmental groups like @BoldNebraska, @IENearth, @MN_350, & @HonorTheEarth and taking the #NoKXLpledge. — Julián Castro (@JulianCastro) August 19, 2019

The Trump administration has long sought to complete the Keystone XL pipeline.

Trump in May signed a presidential permit as a way to jump-start the delayed construction of the 1,179-mile pipeline, a permit which superseded a March 2017 order.

The administration was handed a victory by a 9th U.S. Circuit Court of Appeals panel in June, which removed a key barrier to the construction of the international energy pipeline by nullifying an injunction against a previous permit application.

Keystone XL has been a key issue in national energy policy for much of a decade since its proposal by TransCanada.