WASHINGTON — President Barack Obama will speak at the AFL-CIO convention in Pittsburgh this month.

Obama will address the labor convention Sept. 15. The organization endorsed Obama during last year's presidential election.

Labor unions have been vocal supporters of Obama's proposed health care overhaul. However, the incoming AFL-CIO president has expressed frustration with the president's wavering support of a government-run public option to cover those without health care insurance.

Obama also will travel to Pittsburgh later in the month for the economic summit of the world's top 20 industrial and developing economies.