Story highlights Saudi Arabia, the UAE, Egypt and others cut off diplomatic ties with Qatar earlier this month

The Trump administration's messaging on the crisis has been inconsistent

(CNN) Secretary of State Rex Tillerson said Wednesday that the United States is waiting to see whether a "list of demands" presented to Qatar by a coalition of its Gulf neighbors and their partners are "reasonable and actionable," one day after the State Department's top spokeswoman questioned the continued diplomatic freeze.

"In regards to the continuing dispute within the (Gulf Cooperation Council), we understand a list of demands has been prepared and coordinated by the Saudis, Emiratis, Egyptians, and Bahrainis," Tillerson said in a statement. "We hope the list of demands will soon be presented to Qatar and will be reasonable and actionable."

"We support the Kuwaiti mediation effort and look forward to this matter moving toward a resolution," he added.

A day earlier, State Department spokeswoman Heather Nauert said the United States was "mystified" by the failure of Saudi Arabia and its allies to justify the ongoing isolation of Qatar, a key US partner in the fight against ISIS.

"Now that it's been over two weeks since the embargo started, we are mystified that the Gulf States have not released to the public, nor to the Qataris, the details about the claims that they are making toward Qatar," Nauert told reporters at a press briefing. "The more time goes by, the more doubt is raised about the actions taken by Saudi Arabia and the (United Arab Emirates)."