President Donald Trump escalated his war of words with the media, sending out an early morning tweet on Sunday that appeared to show him attacking CNN—a frequent target of the president’s ire—in a wrestling-style move.

Trump blasted the network as a “fraud,” using a GIF of his appearance years ago on the World Wrestling Entertainment with a CNN logo superimposed on one of the images. The president’s verbal attacks on the network have amplified in recent days, after CNN was forced to retract an erroneous investigative report on Trump’s ties to Russia that resulted in the resignations of three journalists.

In a statement on Sunday, CNN responded by branding Trump’s “juvenile behavior” that was “below the dignity” of a sitting president.

“It is a sad day when the President of the United States encourages violence against reporters,” the network said. “Instead of preparing for his overseas trip, his meeting with [Russian President] Vladimir Putin, dealing with North Korea or working on his health care bill, he is instead involved in juvenile behavior far below the dignity of his office.”

Trump’s latest tweet comes as even some of Trump’s staunches supporters have begun to question his prolific use of social media. Major votes on health care and tax reform loom on the horizon, and have created divisions among Republicans that call into question Trump’s ability to corral support.

In the last month, at least two polls have shown a clear majority of Americans feel the president uses Twitter too much, and that it may be undermining his political agenda.