President Biden's Democratic presidential challengers are using the party's calls to "strengthen democracy" against it over its plans to hold no primary debates during the nomination-deciding contests next year, something they say is giving them a disadvantage in the race.

Robert F. Kenney Jr., an environmental lawyer and high-profile vaccine critic, and self-help author Marianne Williamson took aim at the Democratic National Committee (DNC) on Monday, calling its process "rigged," and accused it of "invisible-izing" those challenging Biden.

In its party platform, the DNC, in numerous instances, stresses the need to "strengthen our democracy," something appearing to run in contrast with its plans to limit the ability for voters to see their options for president.

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"When you have so many Americans who are concerned about election integrity, we should be doing everything we can in our party [Democrat Party] to show that, you know, this is not rigged, rigged system. That it is actually democracy… people can run and that they can get to debate and that the public is gonna be able to see them, and they’re [the DNC] doing kind of the opposite," Kennedy Jr. said in an interview with Breitbart News.

"There’s too many Americans who already think that the whole system is rigged against them. And this is confirmation of that. And I think that’s troubling," he added.

Williamson, who previously referred to the primary process as "rigged" last month, wrote on Twitter that the plan to hold no debates showed the party was acting as if "there ARE simply no other candidates," and "no other ideas we should discuss about ways to win in 2024, or other ideas we should discuss about ways to repair the country."

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"Too many people are too smart to accept this," she wrote.

"Maybe if people SAW other alternatives they would SEE other alternatives. Trying to sew it up for Biden by invisible-izing his opponents is a PR strategy unworthy of the Democratic Party," she later wrote, linking to a Monday article by The Washington Post about Biden's likely candidacy that made no mention of her or Kennedy Jr.

Williamson and Kennedy Jr. were bolstered in their criticisms by progressive activist Nina Turner, a former surrogate for Sen. Bernie Sanders', I-Vt., 2020 presidential campaign, who also took to Twitter to blast the DNC's plans.

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"The DNC refusing to hold a single primary debate is undemocratic and robs the voters of choice. No one who feels confident in their record and/or ideas would hesitate to stand on them. The DNC should hold debates. This is supposed to be a democratic process," she wrote.

Fox News Digital reached out to the DNC for comment but did not immediately receive a response.

Fox News' Andrew Murray contributed to this report.

China and Ukraine are expected to be the main focal points of South Korean President Yoon Suk Yeol's meeting with President Biden at the White House this week. 

Yoon, who first entered politics only two years ago to run for president of the Republic of Korea (ROK), and his First Lady Kim Keon Hee will join President Biden and first lady Jill Biden for a state dinner Wednesday to commemorate the 70th anniversary of the U.S.-ROK alliance. 

On Thursday, Yoon is expected to deliver a speech at a joint session of Congress, making him the first South Korean president to do so in a decade, according to The Washington Post. 

The White House said the alliance, born out of World War II when the former Soviet Union threw most of its support behind Communist China and North Korea, "is critical to advancing peace, stability, and prosperity for our two countries, the Indo-Pacific, and around the world." 

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"President Biden and President Yoon will highlight the importance and enduring strength of the ironclad U.S.-ROK alliance as well as the United States’ unwavering commitment to the ROK. The Presidents will discuss our shared resolve to deepen and broaden our political, economic, security, and people-to-people ties," White House press secretary Karine Jean-Pierre said in a statement announcing the visit on March 7. 

"The most important thing [for this week] is for it to be an opportunity for the people of both countries to properly recognize the historical significance of the … alliance and its achievements," Yoon told The Post in an interview at his presidential office in Seoul before his venture to the United States. "It is indeed the most successful alliance in history and, above all, an alliance based on values." 

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As China increasingly more boldly challenges the United States' global military and economic dominance, American security pacts with Japan and South Korea hold greater significance. 

Yoon's high-profile visit is complicated by the leak of classified Pentagon documents detailing how South Korea has been grappling with pressure from the United States to supply lethal weapons to support the war in Ukraine from its huge supply of artillery shells the country's been stockpiling since the end of the Korean War in 1953. 

Seoul has so far shied away from sending lethal support to Ukraine out of fear of retaliation from Moscow, but Yoon was quoted as telling Reuters last week that "it might be difficult" for South Korea to "insist only on humanitarian or financial support" if the conflict worsens. 

"Of course, Ukraine is under an illegal invasion, so it is appropriate to provide a range of aid, but when it comes to how and what we will supply, we cannot but consider many direct and indirect relationships between our country and the warring countries," Yoon told The Post.

A range of issues impacting the alliance will likely be discussed between Biden and Yoon this week, including how the Inflation Reduction Act and the Chips Act have negatively impacted South Korean manufacturers and Seoul's desire to acquire its own nuclear weapons instead of relying solely on the U.S. protection guarantee.