President Donald Trump took aim at Saudi Arabia's plan to cut oil production on Monday, injecting new tension into an already fraught alliance that has been clouded by U.S. concerns over the killing of journalist Jamal Khashoggi and the ongoing conflict in Yemen.

Trump's efforts to influence oil production threatens to further strain relations between the two historic allies, even as his administration continues to describe the Saudis as a crucial partner in a shared bid to counter Iranian influence in the Middle East.

But the U.S. president — facing pressure after Republican losses in the midterm elections — is eager to tamp down threats to the economy, including higher gas prices. In a series of tweets, Trump blamed a stock market sell-off on the Democratic victory while pressing the Saudis and OPEC to keep oil production at current levels.