Julián Castro on Monday said that Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE could convert some Republican voters alienated by Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE.

“You can see clearly that Donald Trump is not uniting the Republican Party, whether it’s Speaker Ryan’s opposition to him or that of various evangelicals,” he said on MSNBC’s “MTP Daily,” referring to Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.). "He is, if anything, dividing the party," Castro said of Trump.

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“I think that provides an opening, especially for a candidate like Hillary Clinton who has a record of bringing people together,” added Castro, the secretary of Housing and Urban Development.

“To Secretary Clinton’s credit, she is talking about the issues that matter to people across the board, whether they’re Democrat or Republican, conservative or liberal. Donald Trump is spending all his time insulting people.”

Castro said that Clinton would win over GOP-leaning businessmen typically skeptical of her economic positions when compared with Trump.

“First of all, it’s a big jump to say that folks who are concerned about a strong American economy are Wall Street types,” he said.

“I believe that you have a number of Republicans that are not the Wall Street types but are concerned with those in Middle America,” added Castro, who has previously endorsed Clinton. "Those folks, right now, are going to go to Hillary Clinton.”

Castro added that Clinton’s outreach to disenchanted Republicans would not influence her search for a vice presidential pick, however.

“Secretary Clinton has consistently shown that she has good judgment,” he said when asked if she would consider a GOP running mate. "I have no doubt that she’s going to select a good Democrat, someone who can work across the aisle."

“At the end of the day that’s her choice,” added Castro, who has frequently denied that Clinton is considering him for her ticket. "At the end of the day, that’s her choice. I’ll support that ticket when it comes around.”

Trump’s status as the GOP’s presumptive presidential nominee received a cold reception last week from prominent Republicans including Ryan and Mitt Romney, the party’s 2012 presidential nominee.

Clinton, meanwhile, leads Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.) by several hundred pledged delegates in the race for the Democratic nomination. Her lead swells when including superdelegates, who are unbound prior to the Democratic National Convention.