The US military and state department are recommending sending at least 3,000 more US troops to Afghanistan to fight the Taliban, US media report.
The sources say the Pentagon is also seeking authority to set US troop levels unilaterally, without approval from the White House, and to deploy American conventional forces directly on operations against militants, which would expand their current "train and assist" mission.
Trump is expected to make a decision on his Afghan strategy before a May 25 North Atlantic Treaty Organisation meeting in Brussels, the Post reported.
"This would not only expand the numbers, it would expand the role of the USA military in setting the number of troops needed and it could put our troops closer to the fight", explained ABC's Chief Global Affairs Correspondent Martha Raddatz on Good Morning America Tuesday.
The additional manpower would allow the USA and North Atlantic Treaty Organisation partners to expand what Nicholson called "expeditionary advising packages".
The Washington Post first reported that the plan could involve an increase of at least 3,000 troops, with the USA asking other North Atlantic Treaty Organisation nations to match. "Rather, it's to try to bring about a negotiated end to this conflict".
While Pakistan and other governments have sought to foster separate talks in recent years, progress has been scant since the 2016 death of Taliban leader Akhtar Mohammad Mansour in a USA airstrike.
Trump's change of opinion may be spurred by counsel from his National Security Adviser H.R. McMaster. As a candidate, he questioned the role of USA troops in Afghanistan. CNN reported that, according to officials, troop increases would likely range from 3,000 to 5,000 troops.
The US now has around 8,400 soldiers in Afghanistan with about another 5,000 troops from North Atlantic Treaty Organisation allies. However, there have been restrictions on how close Americans could accompany Afghan forces in combat and on bombing Taliban targets.
Testifying before the Senate Armed Services Committee last February, Operation Resolute Support commander U.S. Army Gen. John Nicholson said the counterterror mission was adequately resourced, but that deploying several thousand more troops for the train, advise and assist mission would help to break the "stalemate" with the Taliban, ISIS-K and other adversaries.
The war already costs the US $23 billion a year, a figure that would jump if the new strategy-which also calls for more aid to the country-was implemented.
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Mattis also learned on his trip from US intelligence officials that the Taliban have been receiving increased munitions shioments, including machine guns, and funding from Russian Federation.
Those failures, and his deep-seated desire to end the war before leaving office, led Obama to craft a plan to cut USA troop levels to 1,000 before leaving office.
Mattis' visit came days after an attack by a Taliban-affiliated militant killed 140 Afghan troops, most of whom were unarmed in a mosque praying at their base.
The US President is receiving a plan and guidance from his national security team as he had asked form, he said adding that that guidance is coming forward.
While the proposed strategy counters Obama's attempts to leave a mere 1,000 troops in Afghanistan by the time he left office-an endeavor he ended up having to slow-it has the support of the Afghan government.
The added troops would allow United States advisers to work with a greater number of Afghan forces, and be closer to the front lines.
"We'll take that decision forward very, very shortly", Mattis told reporters accompanying him on a trip to Denmark for a meeting of the USA -led coalition against the Islamic State of Iraq and Syria (ISIS).
As Afghan forces began bearing the brunt of the fighting, they suffered significant casualty rates.
The generals, however, are not the only ones who favour a stronger commitment to Afghanistan. On Tuesday, the official said that the Pentagon had been instructed to determine its force levels in Afghanistan.
Even backers of a more robust approach concede that the chances of a major peace deal to end the war are low.