President Trump’s top White House expert on Russia won’t attend his meeting with Russian President Vladimir Putin.

Trump and Putin will be joined only by Secretary of State Rex Tillerson and Russian Foreign Minister Sergey Lavrov, as well as translators, according to reports. That leaves a leading Kremlin critic outside the first face-to-face meeting of the two leaders, which Tillerson prefaced by outlining a proposal for significant cooperation in Syria between the United States and Russia.