TransCanada Corp. is planning to build the southernmost portion of its proposed Keystone XL pipeline from Cushing, Okla., to the Gulf of Mexico, Postmedia News reported. US President Barack Obama applauded the decision. The White House press secretary said the administration would work to "expedite" the necessary federal permits. This comes one month after the president stopped the company from building the full pipeline. The proposed line was to run from Hardisty, Alta., to the Gulf Coast.