Democratic Party presidential candidate Hillary Clinton has been trying to court the Latino electorate, but a former aide said she needs a specific Latino vice presidential candidate to improve her victory odds.

Henry Cisneros, who served as mayor of San Antonio between 1981 and 1989 and as secretary for the U.S. Housing and Urban Development (HUD) under President Bill Clinton's administration, said Julián Castro is the first vice presidential running mate option for Clinton.

During the interview with Univision, Cisneros said people within the Clinton campaign notified him about Castro's role in Clinton's campaign.

"What I am hearing in Washington, including from people in Hillary Clinton's campaign, is that the first person on their lists is Julián Castro," said Cisneros, via the San Antonio Express-News.

"That they don't have a second option, because he is the superior candidate considering his record, personality, demeanor and Latin heritage," continued Cisneros. "I think there is a very high possibility that Hillary Clinton may choose Julián Castro."

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Castro has repeatedly dismissed rumors about running for vice president. If Castro does run, he would be the first Latino vice presidential candidate.

Coincidentally, Castro followed a similar career route as Cisneros. Castro previously served as San Antonio mayor between 2009 and 2014 before becoming HUD secretary for Democratic President Barack Obama. Castro also received the national spotlight during his tenure as San Antonio mayor when he delivered the keynote address at the 2012 Democratic National Convention.

Last January, Castro was asked if he was interested in becoming a vice presidential candidate or Texas governor. "We'll see what happens. There's no grand plan," said Castro during an appearance at the National Press Club.

"I'm trying to do a great job at HUD," said Castro, according to The Hill. "I believe that anything that you do in life ... the No. 1 way of being satisfied personally and also to have a great future -- whatever that future is -- is to just do a fantastic job with what's in front of you because if you don't do that, you can kiss any of that future goodbye. So, I'm just trying to do a good job with what's in front of me."

At the event, he did comment about Clinton, who at the time did not officially announce her presidential bid.

"Secretary of State Clinton is obviously an extremely talented person who has made fantastic contributions to our national progress over the last couple of decades," Castro said. "I'm staying out of those politics in this role but I know that she did a great job as secretary of State and I'm confident that if she is elected president, she would do enormous good for the country as well."

Earlier this month, Clinton's campaign to attract the Latino electorate included a roundtable discussion with undocumented immigrant youths in Nevada. At the event Clinton disclosed her stance on immigration reform and President Barack Obama's immigration executive actions.

"If Congress continues to refuse to act, as president, I would do everything possible under the law to go even further," said Clinton. "There are more people like many parents of DREAMers and others with deep ties and contributions to our communities who deserve a chance to stay, and I will fight for them."

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