The Islamic State and the Taliban are headed for a showdown in Afghanistan.

Reports of a mutual declaration of jihad may have brought smiles to the faces of American service personnel and veterans of the war in Afghanistan, but the reverberations could be dramatically destabilizing for the country at its most pivotal moment. In many ways, this is like the two biggest bullies in school suddenly bumping into one another in the hallway and deciding to head out to the bike rack at 3 o’clock to settle the score. Only this time, one of the bullies may find himself at a distinct disadvantage. ISIS might have bitten off a bit too much in challenging the Taliban on their home turf. It’s possible that ISIS might finally be headed for its awaited reckoning.

Reports of he growing feud between the upstart ISIS and the established but aging perennial contender Taliban have grown beyond a war of words into open warfare. As ISIS has declared its challenge to the Taliban’s predominant role in opposing Afghan national government rule in the country, the Taliban have reciprocated in kind. In a letter posted in mid-June, the Taliban leadership responded with a thinly veiled warning for ISIS leader Abu Bakr al-Baghdadi:

“Your decisions made from a distance will result in (ISIS) losing support of religious scholars, mujahideen…and in order to defend its achievements, the Islamic Emirate will be forced to react….” (Radio Free Europe/Radio Liberty, June 16, 2015

Although much of the violence between the two groups has so far been confined to Nangarhar Province in Afghanistan’s restive east, the threat of the battle spreading to other areas of Afghanistan is growing. In early June, battles between the groups became the focal point for much of the violence now wracking Nangarhar. In one incident, ISIS-affiliated fighters ambushed a group of Taliban in Achin District. Ten Taliban militants were reported killed in the clash.

The United States should not be so quick to give up its support for the Afghan military that is battling impressively for control of its country. The American public has in large part been focused on the Levant and Iraq for the better part of a decade. In the wake of the rise of ISIS, this tunnel vision has intensified at the expense of attention paid to Afghanistan. This simply should not and cannot continue.

Drone strikes carried out by United States forces in Afghanistan have augmented Afghan military efforts to push back an onslaught waged by insurgents in 2015. Afghan National Security Forces (ANSF) have battled heartily and have elicited impressive numbers in attrition of enemy forces, but their biggest battle could be just ahead of them with the potential rise of ISIS in Afghanistan.

I’ve written extensively on the problems wracking Afghanistan this past year. Most recently, I’ve addressed the impact of the growing security problems in Northern Afghanistan for the entire region of Central Asia. Although ANSF forces have remained in the fight and elicited great attrition of enemy insurgent fighters in the past few months, it appears the insurgency itself has galvanized significant momentum. This is especially true for the groups battling government forces in Kunduz and Badakhshan provinces.