Mark Levin said Thursday that Republican presidential front-runner Donald TrumpDonald John TrumpSenate gears up for battle over witnesses in impeachment trial Vulnerable Democrats tout legislative wins, not impeachment Trump appears to set personal record for tweets in a day MORE must stop belly-aching about the GOP primary’s rules.

“This has to be the very first election that I can recall — I’m 58 and a half years old now — where the front-runner for the Republican Party is whining and complaining the entire time about the rules being against him,” he said on “Levin TV.”

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“Donald Trump sounds like a liberal to me,” the conservative commentator added. "You know, ‘Oh, my paycheck is too small,’ or ‘I don’t like my work environment,’ or ‘I should get more money. The rich are too rich, the poor are too poor, woe is me, woe is me.'

“Stand up like a man and run for president. If it’s good enough for Abraham Lincoln [and] it was good enough for Ronald Reagan, then by God, it’s good enough for Donald Trump.”

Trump on Tuesday bashed the Republican National Committee, calling its system for picking a GOP presidential nominee “a disgrace.”

“Reince Priebus should be ashamed of himself,” he said of the RNC chairman. "He should be ashamed of himself because he knows what’s going on.”

Levin on Thursday said that Trump’s complaints contradict his results in multiple GOP voting contests nationwide.

“What’s going on here is totally bogus,” he said. "The fact is, as we’ve discussed before, Donald Trump has received about 37 percent of the vote and he has about 45 percent of the delegates.

“If it’s rigged, quote un-quote, it’s rigged for the front-runner,” added Levin, who has endorsed Ted CruzRafael (Ted) Edward CruzSenate Republicans air complaints to Trump administration on trade deal Senate passes Armenian genocide resolution Houston police chief stands by criticism of McConnell, Cruz, Cornyn: 'This is not political' MORE. "If there’s a lack of democracy, quote un-quote, there’s a lack of democracy that helps him.”

Trump leads Cruz in delegates, with 743 to his 545, according to the latest RealClearPolitics delegate count. At least 1,237 delegates are necessary for avoiding a contested Republican national convention in July.

He also leads Cruz and John Kasich by nearly 8 percent nationwide, according to the latest RealClearPolitics average of polls.