President Trump will speak with Russian President Vladimir Putin on Tuesday about potential cooperation to mitigate the civil conflict in Syria.

A White House official confirmed to the Washington Examiner that the two will speak by phone, after Syrian President Bashar Assad meets with Putin face to face. Trump has condemned Russia's continued support of the Assad regime in the face of its chemical weapons attacks and brutal treatment of civilians.

However, Trump has expressed a desire to work with Putin on fighting the Islamic State in Syria. The U.S. has joined a coalition working to force Islamic State fighters from their strongholds throughout Syria.

Trump and Putin met briefly at a trade summit in Vietnam earlier this month, but their conversation was informal. The White House decided against a bilateral meeting between the two leaders at the time, after publicly flirting with the idea.

Trump's relationship with Russia has come under intense scrutiny due to allegations that his campaign secretly coordinated with the Kremlin during the presidential race, when Russians attempted to influence public opinion in Trump's favor. Congressional committees, however, have so far said they have found no evidence of collusion.