ABC NEWS' SUNLEN MILLER REPORTS:
Obama will choose Congresswoman Hilda Solis, D-Calif., as Labor Secretary, a Democratic source close to the transition confirms.
Solis is currently serving out her 4th term in the U.S. House of Representatives. She was the first Latina appointed to the committee on Energy and Commerce.
Solis is Obama's third Hispanic choice for his Cabinet: following Gov. Bill Richardson for Commerce, and Sen. Ken Salazar for Interior.
The formal announcement will likely come Friday from the Obama transition team.