U.S. Secretary of State Rex Tillerson testifies before the Senate Foreign Relations Committee on Capitol Hill in Washington, D.C., U.S., June 13, 2017. REUTERS/Aaron P. Bernstein

WASHINGTON (Reuters) - U.S. Secretary of State Rex Tillerson signaled on Wednesday that he would like more help from China in pressing North Korea over issues including its nuclear program.

“Their cooperation I would say has been notable, but it has been uneven,” Tillerson told a congressional hearing. Washington is discussing North Korea with all of its allies, and it would top the agenda at high-level talks next week between U.S. and Chinese officials.