Top Kurdish politician Ilham Ahmed spoke to Reuters from northeast Syria after returning from Washington where she pressed the new United States administration for political and military support.
"In order to eliminate Daesh, there will definitely be military aid," she said, using an Arabic acronym for Islamic State. Some U.S. officials also believed support could be increased, Ahmed said, describing her meetings as positive.
One of the Trump administration's major decisions will be whether to provide weapons to the YPG despite Turkish objections. The U.S. says weapons provided to the Kurdish-led SDF are so far limited to its Arab elements.
According to Reuters Ahmed said her meetings indicated the SDF would receive continued, if not more, support from the United States.
In addition to meeting U.S. State Department officials and members of Congress, she met with foreign policy advisors to the Trump campaign and she plans to head back to Washington "as soon as possible".
Turkey deployed its army in support of rebel groups in northern Syria in August, launching its own offensive, which the Kurds view as a hostile foreign intervention.
Turkey said this week that the final goal of its incursion into Syria was to cleanse a border region, including Raqqa, of both Islamic State and Kurdish YPG militia fighters.
"This is unacceptable. Turkey will not be allowed" near stable areas where the SDF has driven out jihadists, said Ahmed.
"This will mean heightened tensions," she said. "If they attempt to, there will be clashes, of course."
Northern Syria has become one of the most complicated battlefields of the multi-sided war, with Islamic State fighting there against the Syrian army, Turkish-backed rebels, and the SDF.
"We definitely need more support," said Ahmed, a member of the main Syrian Kurdish party, the PYD.
"We still don't know where Daesh will go after the battle of Mosul," she added. "There's a risk they will come to Syria."
Syrian Kurdish groups and their allies have made moves towards autonomy in the absence of any international deal for a political settlement to the nearly six-year war.
They approved a blueprint for a system of federal government in northern Syria in late December, reaffirming their plans for autonomy in areas they control. Still, Kurdish leaders say an independent state is not the goal.
The United States has voiced opposition to the federal plan.
Elections foreseen as part of the new federal system could take place in six months, Ahmed said, arguing that the model of regional autonomy in northern Syria should be the basis for ending the entire Syrian conflict.
During her meetings in Washington, Ahmed asked for U.S. support for these political ambitions, but has not received any definitive reaction.
"We're not only thinking of the north," Ahmed said. "We have a comprehensive Syrian project."