Late-night host Jimmy Fallon on Tuesday mocked President TrumpDonald John TrumpLieu: There will be 'widespread civil unrest' if Trump fires Mueller Attorneys for Trump, Mueller hold face-to-face meeting to discuss potential interview topics: report Trump tariffs not helpful for nuclear talks, South Korea says MORE over the ouster of Secretary of State Rex TillersonRex Wayne TillersonTrump uses Nowruz to hit Iranian regime Trump informally offered Cohn CIA job before changing his mind: report Trump is not the first president to fire Cabinet officials to bury news MORE earlier in the day. 

“I heard Trump has been telling people that he fired Rex Tillerson all by himself. Trump brags about firing people the same way a toddler brags about using the bathroom alone for the first time," Fallon said on "The Tonight Show."

“In the past few weeks, Gary Cohn, Hope HicksHope Charlotte HicksHicks almost left WH months before she announced her resignation: report Kelly tells White House staff no more personnel changes coming Trump told advisers Kelly's job is '100% safe': report MORE and now Rex Tillerson have all left the White House. Most people have said they’re shocked, while Betsy DeVosElizabeth (Betsy) Dee DeVosOvernight Regulation: Facebook faces new crisis over Cambridge Analytica data | Whistleblower gets record SEC payout | Self-driving Uber car kills pedestrian | Trump bans trading in Venezuelan cryptocurrency Cynthia Nixon to challenge Cuomo for NY governor ‘Saturday Night Live’ targets DeVos over ‘60 Minutes’ interview MORE was like, ‘Wait, how the hell am I still here? Didn't anyone see "60 Minutes"? Pretty popular program,' " he said, referring to the Education secretary's recent interview in which she struggled to answer basic questions about policy. 

The president revealed in a tweet on Tuesday that he had fired Tillerson, and would replace him with CIA Director Mike PompeoMichael (Mike) Richard PompeoTrump informally offered Cohn CIA job before changing his mind: report Trump’s Africa policy takes form with focus on security (and China) Mike Pompeo has skills to bring American diplomacy back to life MORE

Trump told reporters Tuesday morning that he made the decision “by myself,” suggesting he did not speak with Tillerson before firing him.

“I actually got along great with Rex, but really, it was a different mindset,” the president said. 

Fallon's late-night cohort Jimmy Kimmel also hit Trump over Tillerson's firing, making a joke referring to first lady Melania TrumpMelania TrumpA new hurdle for female politicians in the digital age The Hill's 12:30 Report Week ahead in tech: AT&T, DOJ merger fight heads to trial MORE

“I’m starting to think he fires people just so he can get some going-away cake at the party. Trump told reporters he made this decision ‘by myself.’ Like a 5-year-old. ‘I did it all by myself.’ Of course you did by yourself, there’s no one left at the White House anymore. It’s just you and your Slovenian captive,” Kimmel said to gasps and applause. 

“Was that too much? I’ll make a note of that," he added.