House Republican leaders and President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE’s campaign lashed out at Rep. Joaquin Castro Joaquin CastroPompeo accused of stumping for Trump ahead of election Florida Democrat asks FBI to investigate anti-Semitic, racist disinformation Hispanic Caucus members embark on 'virtual bus tour' with Biden campaign MORE (D-Texas), the brother of Democratic presidential candidate Julián Castro, for tweeting out the names and business interests of dozens of donors to the Trump reelection campaign.

Joaquin Castro late Monday used his Twitter account to publish the names of 44 Texans who donated the maximum $2,700 to Trump, specifically calling out the owners of several prominent businesses in San Antonio, where the Castro brothers are from.

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

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Trump campaign communications director Tim Murtaugh accused Castro of “endangering the safety of the people he is supposed to be representing.”

“Democrats want to talk about inciting violence?” Murtaugh said. “This naming of private citizens and their employers is reckless and irresponsible. He is endangering the safety of people he is supposed to be representing. No one should be targeted for exercising their First Amendment rights or for their political beliefs. He should delete the tweet, apologize, and his brother’s campaign should disavow it.”

The Trump campaign also reported Castro’s tweet to Twitter, saying it broke the company’s abuse and harassment provision.

Candidates are required to disclose the names and employers of donors who give $200 or more in Federal Election Commission filings, which are available online for anyone to see.

However, it is unusual for a lawmaker to publish the names and business interests of individual donors of another campaign.

Tensions are running hot between Trump and the Democrats, who blame the president's rhetoric for having contributed to a mass shooting over the weekend in El Paso, Texas, which left at least 22 people dead.

Administration officials, including acting White House chief of staff Mick Mulvaney Mick MulvaneyOn The Money: House panel pulls Powell into partisan battles | New York considers hiking taxes on the rich | Treasury: Trump's payroll tax deferral won't hurt Social Security Blockchain trade group names Mick Mulvaney to board Mick Mulvaney to start hedge fund MORE, have called those attacks unfair.

Police say the suspected shooter had written a manifesto warning about an “invasion” of Latino immigrants, mirroring some of the language the president has used on immigration. However, the shooter also said some of his views preceded Trump's election.

House Minority Leader Kevin McCarthy Kevin Owen McCarthyMcCarthy says there will be a peaceful transition if Biden wins GOP lawmakers distance themselves from Trump comments on transfer of power McCarthy claims protests in Louisville, other cities are 'planned, orchestrated events' MORE (R-Calif.) and Whip Steve Scalise Stephen (Steve) Joseph ScaliseHouse GOP slated to unveil agenda ahead of election House panel details 'serious' concerns around Florida, Georgia, Texas, Wisconsin elections Scalise hit with ethics complaint over doctored Barkan video MORE (R-La.), who was nearly killed in a politically motivated shooting two years ago, called Castro’s tweet “dangerous.”

“People should not be personally targeted for their political views. Period. This isn’t a game. It’s dangerous, and lives are at stake. I know this firsthand,” Scalise tweeted.

Meanwhile, McCarthy said in a tweet, "Targeting and harassing Americans because of their political beliefs is shameful and dangerous."

Texas Republican Senator John Cornyn John CornynQuinnipiac polls show Trump leading Biden in Texas, deadlocked race in Ohio The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Liberal super PAC launches ads targeting vulnerable GOP senators over SCOTUS fight MORE also criticized Castro.

"This is grossly inappropriate, especially in the wake of recent tragic shootings. This win-at-all-costs mentality, publicly targeting an opponent’s supporters, and encouraging retaliation is dangerous and not what Texans have a right to expect from their members of Congress," Cornyn said in his tweet.

Texas' other Republican Senator, Ted Cruz Rafael (Ted) Edward CruzThe Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Cruz blocks amended resolution honoring Ginsburg over language about her dying wish Trump argues full Supreme Court needed to settle potential election disputes MORE, called on Castro to delete his tweet.

"EVERYONE needs to tone the hateful partisan rhetoric way down. This is WRONG & Castro should retract it. In our constitutional Republic, the People rightly hold their representatives accountable; elected representatives should not be vilifying & doxxing their own constituents," Cruz said in a tweet.

-- Updated at 6:19 p.m.