The United States and Qatar signed an agreement on combatting terrorism and its financing during a visit to Doha by U.S. Secretary of State Rex Tillerson, his senior adviser R.C. Hammond told reporters.

"Qatar and the United States have signed a memorandum of understanding between the two counties outlining future efforts Qatar can take to fortify its fight against terrorism and actively address terrorism funding issues," he said.

"This is a hopeful step forward," Hammond added.