The Trump campaign on Tuesday accused Rep. Joaquin Castro (D-Texas) of targeting private citizens after he tried to name and shame prominent Texas Trump donors’ names and employers.

Castro, who is chairman for his brother Julian Castro’s 2020 presidential campaign, has taken to the media this week to allege that President Donald Trump contributed to a mass shooting in El Paso, Texas, last weekend.

Castro even went a step further by posting on his Twitter the names and employers of 44 max-level donors to President Trump’s campaign who live in the San Antonio area, a move that has been called “harassment” of Trump supporters.

In a response, the Trump campaign has blasted Castro, saying the Democratic congressman’s action indicates “How low have Dems sunk?”

“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,” President Trump campaign communications director Tim Murtaugh wrote in a tweet on Tuesday.

Murtaugh then said Castro at least is inviting harassment of these private citizens, and at worst is encouraging violence.

The Trump campaign called on Castro to delete the list of donors and apologize.

The Texas congressman replied that the indivisible group’s graphic he shared did not have private or personal information, saying it was publicly reported information printed in newspapers routinely from the New York Times or Washington Examiner.

But Murtaugh again claimed that Castro “defends tweet inviting harassment (or worse) aimed at private citizens. Listed names & workplaces of Trump donors – i.e., a target list.”

House Minority Leader Kevin McCarthy (R-Calif.) shared the viewpoint of the Trump campaign, saying “Targeting and harassing Americans because of their political beliefs is shameful and dangerous. What happened to ‘when they go low, we go high?’”

Fox News, citing the Trump campaign, said they reported Castro’s tweet to Twitter for violating the platform’s abusive behavior provision stating users cannot “engage in the targeted harassment of someone, or incite other people to do so.”