Revocation is one of the first terms in the permit: https://www.federalregister.gov/documents/2019/04/03/2019-06654/authorizing-transcanada-keystone-pipeline-l

Revocation is one of the first terms in the permit: https://www.federalregister.gov/documents/2019/04/03/2019-06654/authorizing-transcanada-keystone-pipeline-lp-to-construct-connect-operate-and-maintain-pipeline https://www.federalregister.gov/documents/2019/04/03/2019-06... (in that permit, it comes right after revocation of an earlier, similar permit)