He tells MSNBC,
"I hope donors in San Antonio and donors throughout the country, unless you support the white nationalism and the racism that Donald Trump is paying for and fueling, then I hope that you, as a person of good conscience, will think twice about contributing to his campaign... No, what I want is for people to think twice about supporting a guy who is fueling hate in this country."
Anchor Willie Geist pushed back on Castro, asking him "If you agree rhetoric can lead to incitement, even if it triggers one person to do something terrible, does it give you any pause to put these names out in public?"
Meanwhile the Washington Examiner reports that six of the San Antonio Trump donors that Joaquin Castro tried to shame also gave to either him and his brother.
From the Examiner:
The congressman's approach left many of the San Antonio-area Trump donors on the list who gave to the Castro brothers angered and hurt.
“It is just amazing to me that he would do that,” said William Greehey, a philanthropist and former CEO of Valero Energy, who donated $5,000 to Joaquin Castro’s congressional campaign in 2013, covering the primary and general elections.
“Then he's calling me a racist because I'm supporting Trump. I mean, this is just ridiculous.” said Greehey, who noted he started a $100 million homeless campus project that mostly serves Hispanic individuals. “There's a lot of things you don't like about the president and his tweeting, but here Castro is doing the same thing with his tweeting.”...
Donald Kuyrkendall, president of a San Antonio commercial real estate company, shared concern about his family's safety and wondered what the Castro brothers hoped to gain by the Twitter outing of Trump donors.
“Were his intentions to incite people to picket Bill Miller's barbecue or to come to Don Kuyrkendall’s house, you know, assault my wife, make nasty comments?” Kuyrkendall said.
Kuyrkendall said that in wake of the tweet, his lawyer reminded him that he once donated to Julián Castro's mayoral campaign.
“Life is short and this kind of silliness is not good for anybody, especially with the climate we have right now with two mass shootings in a weekend,” Kuyrkendall said. “There's just no reason to highlight individuals and their companies as being some kind of, I don't even know what he thinks we are, bad guys because we support Republicans?”
“I'm just hopeful that none of this gets serious and that my grandchildren and children will be not intimidated by this stuff,” Kuyrkendall said.