He said he'd switched support to Act's David Seymour instead.
"I'm very happy to support David Seymour," Bowker said.
"He's a man that has the courage of his convictions and also believes in supporting businesses, growing the economy and of course freedom of speech.
"We may not always agree but freedom of speech is crucial for a well-functioning democracy - something Seymour believes in and quite obviously Jacinda does not," he said.
Seymour said he himself would not have written the comments that got Bowker in trouble, but said he would not be copying Nash in refusing Bowker's donations.
"I would not have written what Troy wrote myself, but Act believes in free speech and opposes the kind of self-righteous pile-ons where a person is ostracised for an opinion," Seymour said.
Political parties must declare the names of donors when they donate more than $15,000 to a party in a year. The donation must be declared within 10 working days if it is over $30,000.
Registered political parties have to declare within 10 working days when they get more than $30,000 from a single donor within a 12-month period.
Bowker made his first donation to Act in May last year, giving $20,000. He followed this up in December with two donations, totalling $15,000.