Meet the self-proclaimed 'billionaire heiress' who runs the Manhattan Republican Party, was formerly married to Richard Nixon's grandson, and whose signature outfit is a bikini

John is the owner of Gristedes Foods, the largest supermarket chain in New York City, according to Forbes. John entered the grocery business as a part-time cashier while studying at New York University and he purchased his first grocery store in 1969, Forbes reports. He also owns an oil refinery and a radio station, according to Forbes.

John's net worth is $3.1 billion, Forbes estimates.

John has also demonstrated an interest in politics, launching an unsuccessful bid to become the mayor of New York City in 2013, according to Forbes.

"We had so many people to celebrate with us," Catsimatidis told New York Magazine about the 2011 wedding. "Hillary Clinton was at my wedding. We had Henry Kissinger, we had Rudy Giuliani, we had Chuck Schumer. It was a beautiful, bipartisan wedding — everyone had an amazing time."

The couple divorced in 2014, according to New York Magazine.

"I looked up what it meant to be a Republican," Catsimatidis told New York Magazine, "and I saw that being a Republican stood for freedom and opportunity for all, and I was like, of course I'm a Republican!"

Before getting involved with the Manhattan Republican Party, Catsimatidis served as the president of the NYU College Republicans, according to New York Magazine.

Catsimatidis' portion of the GOP breaks with the party's national committee on the issue of abortion, she told New York Magazine.

"My belief is, I'm pro-life, but at the same time, as Manhattan GOP chair, I'm doing my best to fulfill the role that represents our Manhattan Republican Party, and our Manhattan Republican Party is pro-choice, all of our candidates are pro-choice, all of our candidates are pro-gay marriage, all of our candidates are very socially liberal," Catsimatidis said in an interview with New York Magazine's Olivia Nuzzi. "So I feel like I'm acting in the interest of what our constituency is. That's what I'm going to do."

When she's not working with the GOP, Catsimatidis works for Gristedes Foods, according to New York Magazine.

Catsimatidis' Instagram profile is filled with pictures of her in brightly colored string bikinis.

Catsimatidis received a lot of criticism over the photos after she appeared on CNN in January 2019 to discuss the government shutdown, according to New York Magazine.

"When people want to be mean, they'll just make fun of my appearance because that's the petty default that people have," Catsimatidis told New York Magazine. "They usually tend to complain about my feminine anatomy ... The Democrats started attacking my breasts, and the Republicans were defending them, and then I thought to myself, I didn't realize that my breasts were so partisan."