WASHINGTON President Donald Trump and Interior Secretary Ryan Zinke have repeatedly said they oppose selling off federal lands.

I want to keep the lands great, and you dont know what the state is going to do, Trump told Field & Stream magazine in January 2016. He re-emphasized this in a subsequent interview with the Outdoor Sportsman Group : Were not looking to sell off land.

It was over this very issue that Zinke a former Montana congressman resigned as a delegate to the Republican National Convention in 2016. And in a speech one day after arriving at his new post, Zinke promised Interior staffers: You can hear it from my lips. We will not sell or transfer public land.

But a leaked White House infrastructure plan has many conservation groups concerned that Trump and Zinke could soon be singing a different tune: that of the Republican Party , whose platform calls for transferring control of federal lands to states .

The draft plan , which Politico and Axios obtained this week, includes this line: Disposition of Federal Real Property: would establish through executive order the authority to allow for the disposal of Federal assets to improve the overall allocation of economic resources in infrastructure investment.

To be clear, the document is a draft plan one Paul Teller, a special assistant to the president for legislative affairs, told Politico this week does not reflect the final proposal. Nonetheless, it is easy to see how one might read disposal to mean that the government will look to sell off, trade or transfer federal assets, including land, to help pay for crumbling bridges and highways.

White House spokeswoman Lindsay Walters declined to say whether this disposal would include federal lands. We are not going to comment on the contents of a leaked document but look forward to presenting our plan in the near future, she wrote in an email to HuffPost.