The Bashar al-Assad regime cannot continue to delay the progress of the UN facilitated Syrian Constitutional Committee, the U.S. State Department said Saturday.

“The requested preconditions from the Assad regime clearly violate the constitutional committee’s rule of procedure, and are a blatant attempt to delay the work of an important effort that is supported both by the Small Group and Astana Group,” State Department spokeswoman Morgan Ortagus said in a statement.

The statement stressed that the constitutional committee cannot be the only UN Security Council Resolution 2254 line of effort pursued by the international committee.

Read more: US: Assad regime delay work of constitutional committee