Julián Castro, whose name has been mentioned as a potential vice presidential pick for Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE, is using Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE's visit to Texas this week to knock the presumptive GOP presidential nominee.

“Donald Trump's message to the Latino community is clear: You are not American," Castro said in a statement distributed by Clinton's campaign that also went after Trump's stance on the LGBT community.

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"In Trump's America, Latinos wouldn't be welcome, our LGBT brothers and sisters wouldn't be able to marry who they love, and Americans would be discriminated against because of their religion," he said.

Castro, who was appointed secretary of Housing and Urban Development in 2014, is returning home to San Antonio, where he previously served as mayor, on Friday.

Castro is headlining the Texas Democratic Convention amid swirling speculation surrounding the selection of a running mate as the general election showdown with Trump grows closer.

Trump is slated to hold a rally in Dallas on Thursday night and will appear in Houston on Friday night.

"In a time where the Latino community is under attack, we need a leader who will be a partner, not someone who treats Latinos like second class citizens," Castro said in his statement.

"We need a leader who will break down barriers for us, not build a wall. We need a leader who will strive for inclusion, not division," he said, repeating Clinton's line that Trump is "temperamentally unfit" to be president.