Sen. Rand Paul Randal (Rand) Howard PaulSecond GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill MORE (R-Ky.) said early Tuesday that the GOP presidential primary’s rules favor the Republican establishment.

“I hear someone’s been saying that they’re rigged,” he said on MSNBC, referencing GOP presidential front-runner Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE.

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“They’re not rigged – they’re biased,” Paul added. "Rigged would mean that they’re illegal or shady. It’s done somewhat in favor of the establishment.”

Trump on late Monday attacked the GOP’s primary rules, arguing that they are “rigged, disgusting [and] dirty.”

The businessman is unhappy with his party’s nominating requirements, which have let Ted Cruz Rafael (Ted) Edward CruzSenate Republicans face tough decision on replacing Ginsburg Cruz: Trump should nominate a Supreme Court justice next week Renewed focus on Trump's Supreme Court list after Ginsburg's death MORE remain competitive despite trailing in delegates and voter support.

Paul on Tuesday said that establishment Republicans are always concerned with preserving their political power.

“We don’t always know who the establishment is, [but] there’s always people trying to change the rules to their advantage,” said Paul, who suspended his own White House run last February.

Paul also said that Trump and Cruz must watch for significant changes in the Republican National Convention’s rules next July.

“Both Cruz and Trump have a great deal of incentive to not let anyone else have any of their votes,” he said.

“My understanding of the rules is that if they follow the precedent of 2012, Rubio and Kasich’s votes aren’t counted,” Paul added, referencing Sen. Marco Rubio Marco Antonio RubioFlorida senators pushing to keep Daylight Savings Time during pandemic Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Intelligence chief says Congress will get some in-person election security briefings MORE (R-Fla.) and Gov. John Kasich (R-Ohio).

Rubio suspended his presidential campaign last month, while Kasich remains in the race for the Republican presidential nomination.

Trump leads Cruz by roughly 7 points nationwide, according to the latest RealClearPolitics average of polls. He also has 743 delegates to Cruz’s 545.