Secretary Julian Castro, serving as head of the Department of Housing and Urban Development, could be the country's next vice president, making him the first Latino to take the position in the country's history. However, Castro does not seem so sure it will happen.

During an interview with MSNBC's Andrea Mitchell, Castro expressed caution concerning the possibility of becoming Hillary Clinton's running mate in 2016. The former secretary of state has been wooing Latino voters with new stances on immigration reform as well as adding various Latinos to her campaign.

"I'm certainly flattered by it, but I'm not holding my breath," Castro said. "Of course I have seen that talk and think anybody would be flattered by that."

Castro refers to comments made by Henry Cisneros, former mayor of San Antonio as well as housing secretary during the Clinton administration.

"[Castro] is the superior candidate considering his record, personality, demeanor and Latin heritage," Cisneros said. "I think there is a very high possibility that Hillary Clinton may choose Julián Castro."

However, Castro wants to focus more on his current work as secretary of housing.

"I have found that if you do a great job with what is in front of you, with what you're doing now, that's the way to have a good future," Castro said.

A poll conducted by Latino Decisions in 2013 found Castro to be one of the most favorable Latino politicians. Some 34 percent of respondents had a favorable rating of the then-San Antonio mayor compared to 7 percent unfavorable.

The poll also revealed that if he were to run as a Democrat's vice president, Latino voters would be 62 percent overall more likely to vote for him or her.