evidence: Those same traits are now on display in Mellon’s political giving. A railroad magnate and scion of one of the country’s wealthiest families, Mellon, 81, is the biggest donor to Donald Trump so far this cycle. He has contributed more than $75 million to a super PAC supporting the former president’s bid to return to the White House — significantly more than he gave in 2016 or 2020. Mellon made the donations without so much as a sit-down meeting with Trump’s aides, according to people familiar with the dynamic, who, like some others interviewed for this article, spoke on the condition of anonymity to discuss private dealings or avoid retaliation from Mellon, who estimated his net worth at $700 million in the 2014 deposition. [...] Mellon’s largesse isn’t limited to Trump, whom Republicans officially nominated for president on Monday at their national convention in Milwaukee. Mellon has also given more than $25 million to groups supporting Robert F. Kennedy Jr., now running as an independent after first mounting a Democratic primary challenge to President Biden. [...] After contributing only modest sums to Trump’s campaign in 2016, Mellon put $20 million into a pro-Trump super PAC in 2020. The following year, he contributed more than $50 million in stock to an effort by Texas Gov. Greg Abbott (R) to crowdsource private funding for a border wall.