WASHINGTON - Russian Foreign Minister Sergey Lavrov is reacting sarcastically to questions about President Donald Trump's firing of former FBI Director James Comey.

Lavrov and Secretary of State Rex Tillerson were asked during a photo-op whether Comey's firing cast a shadow over the meeting between the two diplomats.

Lavrov said: "Was he fired? You're kidding. You're kidding." Then the Russian diplomat waved his hand dismissively and exited the room alongside Tillerson.

The meeting comes amid growing concerns about Trump's decision to fire the head of the law enforcement agency investigating Russian interference in the U.S. election and possible collusion by Trump's campaign.

Lavrov is scheduled to meet later Wednesday with Trump at the White House.

Russian President Vladimir Putin's spokesman says Moscow isn't concerned about the firing of the FBI director.

Dmitry Peskov says Russia hopes that President Donald Trump's decision to fire the FBI's James Comey won't affect U.S.-Russia ties "in any way."

Peskov calls it "an entirely domestic matter" for the United States.