However, it acknowledges that terrorism "cannot be defeated with any sort of

finality."

Michael Anton, spokesman for the White House National Security Council, said, "As part of its overall approach, the administration is taking a fresh look at the entire U.S. national security strategy, to include the counterterrorism mission - which is especially important since no such strategy has been produced publicly since 2011."

The process is aimed at ensuring "the new strategy is directed against the pre-eminent terrorist threats to our nation, our citizens, our interests overseas and allies," Anton said. "Moreover, this new strategy will highlight achievable and realistic goals, and guiding principles."

Combating Islamic extremism was a major issue for Trump during the 2016 presidential campaign. The draft strategy paper, which officials said was still being fine-tuned at the White House, describes the threat from Islamic militant groups in stark tones.

It remains to be seen how Trump can square his goal of avoiding military interventions with ongoing conflicts involving U.S. troops in Iraq, Syria, Afghanistan, Yemen and elsewhere.

Rather than scale back U.S. commitments, he has so far largely adhered to former Obama administration plans to intensify military operations against militant groups and granted the Pentagon greater authority to strike them in places like Yemen and Somalia.

Trump may soon reverse years of Obama-ordered drawdowns in Afghanistan. His administration is now considering boosting by 3,000 to 5,000 soldiers the 8,400-strong U.S. contingent helping Afghan forces fight a resurgent Taliban, current and former U.S. officials say.

A senior administration official noted that only a small number of troops have been added to U.S. forces in Iraq and Syria under Trump, at the discretion of his military commanders.

"If you do see additions elsewhere, they will be in keeping with this (draft) strategy," said the official, who spoke on condition of anonymity. The increased pace of U.S. military operations has seen a recent spate of American casualties. The latest came in Somalia, where a Navy SEAL died and two others were wounded in an attack by al Shabaab militants, U.S. officials said on

Friday.

Since President Barack Obama released the last U.S. counterterrorism strategy in 2011 before the emergence of Islamic State, the threat has "diversified in size, scope and complexity from what we faced just a few years ago," the draft strategy said.

In addition to Islamic State, the United States and its allies are endangered by a reconstituted al Qaeda, groups such as the Haqqani network and Hezbollah, as well as from homegrown extremists radicalized online, it said.

Bruce Hoffman, director of Georgetown University's Center for Security Studies and who reviewed the document at Reuters' request, said the draft strategy "paints - and I think accurately - a more dire picture" of the threat than the Obama document, which sounded a "triumphalist" tone following al Qaeda leader Osama bin Laden's death in a 2011 U.S. raid in Pakistan.