The decision to advance the pipelines cast aside efforts by President Barack Obama's administration to block construction of the two pipelines, while making good on one of Trump's campaign promises.
As he signed the documents Tuesday in the Oval Office, Trump also vowed to "renegotiate some of the terms" of the Keystone bill and said he would then seek to "get that pipeline built."
Trump also issued executive actions declaring oil pipelines constructed in the US should be built with US materials, streamlining the regulatory process for pipeline construction and shortening the environmental review process.
Trump during his campaign said he would streamline the approval of the Keystone XL pipeline, which was stalled for years in the Obama administration until Obama denied approval for the pipeline's construction altogether in November 2015.
And Trump said for the first time in December that he supported construction of the Dakota Access Pipeline, which stalled last year amid protests opposing its construction on Native American lands. The Obama administration denied the company a permit it needed to complete the pipeline late last year.
