During a visit from Singapore's prime minister on Tuesday, President Barack Obama will extol the Trans-Pacific Partnership (TPP) trade deal and commit to getting the deal done, a top White House official said on Friday, even though Obama's fellow Democrats panned it at their convention this week.

Obama wants the U.S. Congress to approve the 12-nation trade deal, which he sees as a central part of his economic and foreign policy legacy, before he leaves the White House on Jan. 20.