The Silicon Valley billionaire Peter Thiel’s relationship with Donald J. Trump turned ice-cold in the middle of 2023, when the former president excoriated Mr. Thiel on a private phone call over his unwillingness to support Mr. Trump’s re-election bid.

Now, after Mr. Trump chose one of Mr. Thiel’s closest political acolytes as his running mate, there appears to be a thaw.

Mr. Thiel is warming toward supporting the Republican ticket, he said in an interview on Friday, although he stopped short of making a formal endorsement. He also said he was not yet prepared to make a big donation to help elect Mr. Trump and his vice-presidential pick, Senator JD Vance of Ohio — remaining noncommittal and sounding dour about whether his money…