Afghan President Ashraf Ghani has offered to negotiate ways to minimize the costs of keeping U.S. troops in Afghanistan amid concern that U.S. forces will pull out of the region prematurely, a new report says.

Although Ghani did not include specific proposals for how to cut costs of U.S. troops and contractors in Afghanistan, his letter to President Trump dated Monday says the objective is “maximum effectiveness to aid efficiency.” He also requested Trump visit Afghanistan soon to “discuss a mutually beneficial path forward toward lasting peace and increased security for both of our countries and peoples,” the Wall Street Journal reports.