US President Barack Obama is making final decisions on a broad new nuclear strategy for the United States that will permanently reduce the US nuclear arsenal by thousands of weapons, The New York Times reported Monday.

But citing unnamed senior presidential aides, the newspaper said the administration had rejected proposals that the United States declare it would never be the first to use nuclear weapons.

Obama?s new strategy — which would cancel or reverse several initiatives undertaken by the administration of former president George W. Bush — will be contained in a nearly completed document called the Nuclear Posture Review, the report said.

Aides said Secretary of Defense Robert Gates will present Obama with several options on Monday.

Obama?s critics argue that his embrace of a new movement to eliminate nuclear weapons around the world is naive and dangerous, especially at a time of new nuclear threats, particularly from Iran and North Korea, the paper said.

But many of his supporters fear that over the past year he has moved too cautiously, and worry that he will retain the existing US policy by leaving open the possibility that the United States might use nuclear weapons in response to a biological or chemical attack, perhaps against a nation that does not possess a nuclear arsenal, the paper noted.

That is one of the central debates Obama must resolve in the next few weeks, according to his aides.