I do believe it was reapproved under Trumps administration, & I’m no Trump fanboy either. TC Energy had ditched most of its pipeline assets in the Dakotas after Obama.
Keystone XL Pipeline political timeline
Ballotpedia: The Encyclopedia of American Politics
November 2015, the State Department under President Barack Obama (D) denied TransCanada a permit to approve the pipeline.[1]
On March 24, 2017, the U.S. State Department under President Donald Trump (R) issued a presidential permit approving the Keystone XL pipeline. Trump signed an executive order in January to expedite final approval of the pipeline within 60 days. In the executive order, Trump also invited TransCanada, the pipeline's owner, to resubmit its application for a permit. On January 26, 2017, TransCanada resubmitted its application for approval.[2][3][4][5][6][7]
In November 2017, the Nebraska Public Service Commission voted 3-2 to approve construction of a portion of the Keystone XL pipeline in Nebraska, though the commission rejected TransCanada's preferred route for the pipeline.
On November 9, 2018, U.S. District Judge Brian M. Morris blocked the permit issued by the Trump administration. Morris ruled that a supplemental environmental review had to be completed before the construction could proceed.[8]
On January 20, 2021, President Joe Biden (D) signed an executive order which revoked the permit for the Keystone XL Pipeline.[9]