'Embracing His Inner Internet Troll:' Watch CNN Host Don Lemon Accuse Donald Trump of Having a 'Meltdown'

President Donald Trump is collapsing under the pressure of Special Counsel Robert Mueller's investigation into Russian meddling in the 2016 presidential election, according to CNN host Don Lemon.

Speaking on CNN Tonight Wednesday, Lemon let loose on Trump following the president's latest controversial Twitter tirade. "There's really no other way to say this. No other way," Lemon told his audience. "The president of the United States is having a meltdown."

"Yes, again. And the reason is very clear," he added. "Robert Mueller is getting under his skin."

Amid growing speculation that Mueller's probe is moving into its endgame, Trump retweeted an image Wednesday depicting two former U.S. presidents—Barack Obama and Bill Clinton—and his own Deputy Attorney General Rod Rosenstein behind bars, accusing them of treason. Also included were Hillary Clinton, James Comey and Mueller himself.

Written across the top of the image are the words: "Now that Russia collusion is a proven lie, when do the trials for treason begin?"

According to Lemon, Trump is "embracing his inner internet troll, slamming a who's who of prominent people the president and his supporters think of as enemies and accusing them of treason, which, mind you, can carry the death penalty."

"It is impossible to overstate just how shocking it is for the President of the United States to retweet something like this, or it should be," Lemon continued. "And anybody who says it's just a tweet, I want you to remember this. The White House has told us that this president's tweets are official statements."

Lemon added, "If this president feels more threatened by Mueller, if he feels his presidency is threatened, what will he do next?"

Developments in Mueller's investigation this week have led some observers and journalists to suggest the special counsel is nearing the end of his probe, and that he could be preparing explosive new charges.

Paul Manafort, Trump's former campaign chairman, was this week accused of lying to the FBI and special counsel's office despite having agreed to cooperate with them after being convicted of multiple counts of fraud in August. This violates his plea deal and leaves the 69 year old facing the rest of his life in jail.

Despite his plea deal and convictions, Trump and Manafort's legal teams have maintained a joint defense agreement. The president's attorney Rudy Giuliani confirmed Wednesday that Manafort's legal team has been providing Trump's lawyers with regular briefings about the Mueller investigation that could help their defense strategy.

There is speculation that Manafort is still angling for a presidential pardon through his continued alliance with Trump. In an interview with The New York Post published Wednesday, the president said of a pardon, "I wouldn't take it off the table. Why would I take it off the table?"

'Embracing His Inner Internet Troll:' Watch CNN Host Don Lemon Accuse Donald Trump of Having a 'Meltdown' | U.S.