President Barack Obama ends three months of exacting deliberations Tuesday to outline his new Afghan strategy -  30,000 additional U.S. troops to beat back an emboldened Taliban insurgency and train local government troops, the Associated Press has reported.

In what may be the defining speech of his presidency and a gamble that could weigh heavily on President Obama’s chances for a second White House term, the president will address the country in a televised speech from the U.S. Military Academy at West Point, New York.

President Obama hopes to restore support for the war effort among an American public grown increasingly pessimistic about success and some fellow Democrats in Congress wary of - or even outright opposed to - spending billions more taxpayer dollars and putting tens of thousands more U.S. soldiers and Marines in harm’s way.

A senior administration official said President Obama would inject the additional 30,000 troops on an accelerated schedule, bringing the total in Afghanistan to more than 100,000 U.S. by summer. The official spoke on condition of anonymity because the details had not yet been announced.

At the same time, NATO diplomats said President Obama was asking alliance partners in Europe for between 5,000 and 10,000 additional troops to the separate international force in Afghanistan. It remained uncertain what response that request would meet, given the Afghan war has even less support in Europe than in the United States, where backing for the 8-year-old conflict has plummeted since President Obama took office in January.