The former Pres. Trump, has nominated JD Vnce as his VP running mate. This is according to the NYTimes and Trumps Social Media post:

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Vance is a Senator from Ohio. He is 39 year old

Vance was once a critic of the former Pres. where he called him "cultural heroin" and "noxious". He also liked a tweet saying Trump committed “serial sexual assault.”

“I’m a Never Trump guy,” Vance said in an interview with Charlie Rose in 2016. “I never liked him.”

He later made amends and said “I just think the results [of Trump’s presidency] were so good…. I was critical of Trump in 2016, but he proved me wrong.”

Trump did endorse Vance in his 2021 nomination for Ohio's senate seat and he won that election in the 2022 midterms.

He is young. He is smart (graduating from Ohio State in 2 years and then going to Yale Law School. He is from the rust belt and understand the plight of midwest. Trump will need Michigan, Pennsylvania and Wisconsin and Vance could help that need. That would be enough to reverse the electoral college in his favor (all other states remaining the same). Those states represent 46 electoral votes which if won by Trump in 2020 would have put him over the top with 276 for Trump vs 260 for Biden.

PS Trump was officially declared as the official nominee of the Republican Party.