In a sign of the ongoing internal dissent over ending the landmark nuclear agreement with Iran, multiple sources told the Washington Free Beacon that Secretary of State Rex Tillerson and United Nations Ambassador Nikki Haley have been at odds over the deal, with Trump’s U.N. ambassador privately expressing dismay with Tillerson over his continued efforts to preserve the nuclear agreement.

Tillerson and Haley held a private powwowWednesday with international leaders regarding the future of the nuclear deal, a sign of Haley’s vital role in the Trump administration’s key foreign policy issue.

The meeting is likely to underscore mounting tensions between Haley and Tillerson on the issue, according to multiple sources with knowledge of the situation, who told the Free Beacon that Haley views Tillerson’s efforts to preserve the deal as anathema to Trump’s own policy agenda.

The division is one of several that Tillerson has sparked within the administration, particularly in the West Wing, where the secretary of state has been described as in “open war” with Trump on a series of major foreign policy issues, including Iran and the Israel-Palestinian impasse.