Mitt Romney is interjecting a bit of humor into his criticism of Republican presidential front-runner Donald TrumpDonald John TrumpO’Malley tells Dems not to fear Trump Right way and wrong way Five things to know about the elephant trophies controversy MORE
 
Romney appeared on "Jimmy Kimmel Live" on Tuesday night, during which he read a series of mean tweets aimed at him from Trump supporters.
 
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Romney read a tweet from Trump himself criticizing the 2012 GOP nominee for losing and noting that another rival who challenged Trump this year, Sen. Lindsey GrahamLindsey Olin GrahamAlabama election has GOP racing against the clock Graham on Moore: 'We are about to give away a seat' key to Trump's agenda Tax plans show Congress putting donors over voters MORE (R-S.C.), "got ZERO" and dropped out.
 
"Got zero? The only people I know who got zero are the ones who paid $25,000 to be at Trump University," Romney quipped.
 
A tweet from a Trump supporter asked where the former Massachusetts governor buys "the shoe polish" for his hair. Romney joked, "I buy it at Costco in bulk."
 
Trump responded to the jokes Wednesday morning, sarcastically labeling Romney a "wise guy."
 
"He should be trying to unify the party, not tearing the party apart," Trump said on "Fox and Friends" after Romney's speech last week ripping Trump, which polling suggests may have backfired.
 
"Instead of fighting it, they should be embracing it," Trump said of his critics in the GOP establishment.