"Throughout their trip, Ambassador Jeffrey… will also address Russia’s specious allegations of international plans to stage a chemical weapons attack in Syria," the release said on Friday.
Russian officials have said they have evidence that terrorists in Idlib are currently preparing to conduct a false-flag chemical weapons attack in order to spark a military intervention by the United States and its allies.
"They will also underscore that the United States will respond to any chemical weapons attack perpetrated by the Syrian regime," the State Department said. Jeffrey and Rayburn will also reiterate to their Jordanian and Turkish counterparts that the United States believes a military offensive in Idlib will escalate the crisis in Syria.
READ MORE: State Department Says US Will Respond to Chemical Weapons Use in Idlib, Syria
Meanwhile, Turkish Foreign Minister Mevlut Cavusoglu said on Friday that he had met with President of the Syrian Negotiations Commission Nasr Hariri to discuss the situation in the Syrian province of Idlib.
"At our meeting with Nasr Al-Hariri, president of Syrian Negotiations Commission, we exchanged views on recent developments in Syria, including Idlib and also the period ahead concerning the political process," Cavusoglu wrote on his Facebook page.
Speculation about the possibility of a chemical weapons attack in Syria has grown in recent weeks. Earlier on Friday, Russian Foreign Minister Sergey Lavrov reiterated the warning, saying that a provocation involving the use of chemical weapons is being planned in the province of Idlib.
On April 14, the United States, the United Kingdom and France launched over 100 missiles on multiple targets in Syria in response to the alleged chemical weapons attack in the Syrian city of Douma. Russian President Vladimir Putin said that the strikes were carried out in violation of the norms and principles of international law.
READ MORE: White Helmets Kidnapped 44 Children to Stage Chemical Attack in Idlib