U.S. President Barack says he will deploy 30,000 more troops to Afghanistan and start pullout of U.S. troops from that country in July 2011, according to excerpts released by the White House ahead of his address to the nation on Tuesday night.

The first batch of additional troops will arrive by Christmas and the overall buildup will be completed by next summer, a senior administration official told reporters at a conference call ahead of Obama's address, speaking on the condition of anonymity.

The official also said Obama would underscore his commitment to stabilizing Afghanistan and scouring corruption out of the Afghan government.