The Trump 2020 campaign demanded Tuesday that Rep. Joaquin Castro – the twin brother of 2020 White House hopeful Julian Castro – delete a tweet that publicly named and shamed some of the president’s biggest Texas donors in advance of his visit to El Paso on Wednesday.

“How low have Dems sunk?” Trump campaign communications director Tim Murtaugh tweeted. “This is Joaquin Castro, Congressman & chair of his brother’s campaign. Naming private citizens & their employers, targeting them for their political views and exercising 1st Amendment rights.”

Murtaugh said that at the very least Castro “is inviting harassment of these private citizens. At worst, he’s encouraging violence.”

“This is a target list,” he added.

Castro tweeted a list of the 44 San Antonio donors who contributed the maximum to Trump. It included their names and employers.

“Sad to see so many San Antonians as 2019 maximum donors to Donald Trump,” Castro wrote, then naming some of the contributors.

“Their contributions are fueling a campaign of hate that labels Hispanic immigrants as ‘invaders.’”

Donor data is disclosed by campaigns and publicly available through the Federal Election Commission.

Castro later tweeted that the graphic “doesn’t have private or personal info.”

He added that Trump’s campaign has “stoked fear of brown-skinned immigrants.”

The tweet comes as the presidential hopefuls have blamed Trump’s rhetoric about immigrants for inciting the El Paso massacre at a Walmart over the weekend.

“Right now, we have to decide what kind of nation we’re going to become,” Julian Castro, the only Hispanic candidate, said after the mass shooting. “The attack that we saw in El Paso two days ago was a result of hate and bigotry. For four years now, since he launched his campaign, Donald Trump has made hate and bigotry and division a political strategy. The attack two days ago was an attack on the Latino community, it was an attack on immigrants, it was an attack on Mexicans and Mexican Americans — and that is no accident.”

Trump will visit El Paso and Dayton, Ohio, on Wednesday.