Billionaire and The Shark Cat Star Mark Cuban confronted Bill Ackman and Charlie Kirk, allies of former President Donald Trump, in a series of social media posts on Sunday.

Trump, the Republican presidential nominee, will face Vice President Kamala Harris in November, who became the Democratic nominee after President Joe Biden dropped out of the race on July 21.

In a lengthy Sunday post on X, formerly Twitter, Ackman, also a billionaire, criticized Biden for dropping out of the race and the Democrats’ subsequent nomination of Harris, writing that the “American people have been misled.”

“How can you believe anything she says? Even if you listen carefully to her or read the transcripts of the four interviews and one debate she participated in, it is almost impossible to understand what she is saying. She has yet to answer a direct question about the economy, the border or foreign policy,” wrote Ackman, who endorsed Trump in July.

Harris had previously outlined her economic policy agenda, calling for higher taxes on high-income households, larger tax deductions for startup companies and more financial support for first-time home buyers.

On the southern border, Harris said during her speech at the Democratic National Convention in August that she would revive the bipartisan border security agreement that was rejected by Senate Republicans in May. On foreign policy, Harris has promised to “strengthen, not abandon” America’s global leadership role and has twice stated that the U.S. will defeat China in the “competition of the 21st century.”

Responding to Ackman’s post, Cuban, a frequent critic of Trump, wrote: “When the competition hires a new CEO and she kicks your ass.”

Ackman, the CEO of Pershing Square Capital Management, had previously voted for Biden, writing in his X-post: “I voted for @JoeBiden because after @realDonaldTrump’s first term, I believed the country would benefit from a more centrist candidate.”

He also apologized for “voting for Biden,” adding that “that was a big mistake.”

In another X-post, apparently in response to Ackman’s claim that “Harris’ entire candidacy rests on the support of an unnamed cabal of party leaders,” Cuban asked, “Would you consider donations raised a good indicator of relative support? She’s only raised three times what he has.”

By the end of August, just four weeks after launching her campaign, Harris had already raised about $500 million, according to a Reuters report citing four anonymous sources “familiar with the fundraising effort.”

Of the reported $500 million, $200 million was raised in the first week of Harris’ campaign, totaling $310 million in July. In comparison, Trump’s campaign raised $138.7 million in July.

Newsweek has emailed the Trump and Harris campaign teams for comment.

Meanwhile, Kirk, founder and president of the conservative organization Turning Point USA, took aim at Harris in response to her Saturday post on X regarding her economic plan that would “give first-time home buyers a $25,000 down payment.”

“And houses would just go up $25,000 in price. Why is that so hard for her?” Kirk, a Trump supporter, wrote on X.

In response, Cuban shared a screenshot of the down payment assistance program in Austin, Texas, highlighting a section that states, “The sales price of the home cannot exceed $525,350.”

In another X-post, Cuban addressed Kirk: “Hey @charliekirk11 if you’re looking to buy a home in Houston for the first time, we’ve got some inflation-free help for you here,” with a screenshot of the Houston, Texas Home Buyer Assistance page, which lists the eligibility for the program, which offers $50,000 to income-eligible residents.

What the polls show

This comes as the economy has become a central issue for voters, with Trump and Harris looking to address the issue before November and polls consistently showing the economy at the forefront of voter sentiment this election.

The latest New York Times/A Siena College poll conducted between September 3 and 6 showed the same trend: 22 percent of likely voters chose the economy and jobs as the most important issue, ranking above all other issues.

However, polls have mixed results about which candidate voters trust most on economic issues.

Survey published by the Financial Times And the University of Michigan found this month that voters trust Harris more on economic issues than Trump (42 percent to 41 percent), regardless of their opinion of her and her campaign intentions.

However, only 12 percent of respondents said they believe Harris’ economic policies will make them “significantly better off” financially, while 22 percent said the same about Trump’s policies. Of the 1,001 registered voters surveyed, only 25 percent reported a positive economic situation in the country.

Other polls show Trump well ahead of Harris on economic issues. An Aug. 8 CNBC All-America Economic Survey found that voters believe they will be better off financially under Trump than under Harris by a 2-to-1 ratio.

In a national poll conducted by NBC News Sept. 13-17 and released Sunday, Trump led Harris by 9 points on the economy (50 percent to 41 percent). When NBC News asked voters whether Trump or Biden would do a better job of handling the economy in January, Trump led Biden by 22 points. NBC News’ Sunday poll surveyed 1,000 registered voters and has a margin of error of plus or minus 3.1 percentage points.