Donald Trump has named 39-year-old Sen. JD Vance of Ohio as his running mate on the GOP’S 2024 national ticket.

The former president, who made his greatly anticipated and high-stakes announcement on Monday as the Republican National Convention kicked off in swing-state Wisconsin’s largest city, will now share the ticket with one of his top supporters in the Senate and a one-time Trump critic who has transformed into a leading America First disciple.

“After lengthy deliberation and thought, and considering the tremendous talents of many others, I have decided that the person best suited to assume the position of Vice President of the United States is Senator J.D. Vance of the Great State of Ohio,” Trump announced on his Truth Social platform.

Trump emphasized that Vance, on the campaign trail “will be strongly focused on the people he fought so brilliantly for, the American Workers and Farmers in Pennsylvania, Michigan, Wisconsin, Ohio, Minnesota, and far beyond….”

Vance, a former venture capitalist and the author of the bestselling memoir, “Hillbilly Elegy,” before running for elective office, was one of a handful of Republicans considered top running mate contenders. That group included North Dakota Gov. Doug Burgum and Sens. Marco Rubio of Florida and Tim Scott of South Carolina.

Former U.S. President Donald Trump and Republican candidate for U.S. Senate JD Vance
Former President Trump, left, and then-Republican candidate for U.S. Senate JD Vance greet supporters during the rally at the Dayton International Airport on Nov. 7, 2022 in Vandalia, Ohio. (Photo by Drew Angerer/Getty Images)

While Vance hails from Ohio, a one-time battleground state the former president comfortably carried in the 2016 and 2020 elections, the senator’s selection is expected to boost Trump among working-class Democrats, especially across the Rust Belt, who otherwise might have been supporters of President Biden, according to multiple experts who spoke with Fox News Digital as Trump was weighing his options.

Vance grew up in a working-class family in a small city in southwestern Ohio. His parents divorced when he was young, and as his mother struggled for years with drug and alcohol abuse, Vance was raised in part by his maternal grandparents.

After high school graduation, Vance enlisted in the U.S. Marine Corps and served in the Iraq War. He later graduated from Ohio State University and then earned a law degree at Yale University.

Vance, who lives in Cincinnati, moved to San Francisco after law school and worked as a principal in a venture capital firm owned by billionaire venture capitalist Peter Thiel, who later became a major financial supporter of Vance’s successful 2020 campaign for the Senate.

Senator JD Vance, a Republican from Ohio, speaks to members of the media outside the Manhattan Criminal Courthouse in New York, on Monday, May 13, 2024 during former President Trump’s criminal trial. (Victor J. Blue/Bloomberg via Getty Images)

Before running for Senate, Vance grabbed national attention after “Hillbilly Elegy” – which tells his story of growing up in a struggling steel mill city and his roots in Appalachian Kentucky – became a New York Times bestseller and was made into a Netflix film. The story spotlighted the values of many working-class Americans who became supporters of Trump’s policies.

Vance was a vocal critic of Trump when the former president first ran for the White House in the 2016 cycle.

However, Vance eventually supported Trump, praising the former president’s tenure in the White House, and in a Fox News interview in 2021, he apologized for his earlier criticism of Trump.

Trump’s endorsement of Vance days before the 2022 GOP Senate primary boosted him to victory in a crowded, competitive and combustible nomination race.

“Look, I was wrong about Donald Trump. I didn’t think he was going to be a good president,” Vance told Fox News’ Bret Baier in an interview last month. “He was a great president, and it’s one of the reasons why I’m working so hard to make sure he gets a second term.”

In the Senate, Vance has been one of the most vocal supporters of Trump’s America First agenda and has been a vocal opponent of U.S. aid to Ukraine.

U.S. Senator JD Vance (R-OH) speaks during a Senate Commerce, Science and Transportation Committee hearing titled “Improving Rail Safety in Response to the East