"When my grandmother got here nearly a hundred years ago, I'm sure that she never could have imagined that just two generations later, one of her grandsons would be serving as a member of the United States Congress and the other would be standing with you here today to say these words: I am a candidate for president of the United States of America", Castro said.
Two senior Democratic politicians have announced that they will challenge for the USA presidency in 2020.
Democrats are piling on for the opportunity to take on President Donald Trump, whose job approval rating halfway through his four-year term hovers around 42 percent, according to a Real Clear Politics survey of recent polls.
"What I believe is that he's created a tragedy at the border", Castro said on CBS's "Face the Nation" on Sunday. He also said that he disagrees with the administration's goal of detaining families together as they seek asylum or refugee status, saying that other approaches such as using ankle monitors are more humane and can be effective to track people who enter the US and are awaiting court proceedings.
Castro would become the most high-profile Democrat to date to officially enter the 2020 race, which is expected to include a diverse field of candidates eager to challenge President Donald Trump.
"There are serious issues that need to be addressed in our broken immigration system, but seeking asylum is a legal right".
"There is no way in hell that caging babies is a smart or a right or good way to do it".
"As president, my first executive order will recommit the United States to the Paris climate accord", Castro vowed, referencing the global deal that Trump ditched just months after taking office. Elizabeth Warren, D-Mass., and Rep. Tulsi Gabbard, D-Hawaii, that she plans to run.
In 2014, President Barack Obama chose Castro to run HUD. "We say no to scapegoating immigrants", he said.
CoA emails Hardik Pandya, KL Rahul informing of suspensions
Even Pandya had earlier mentioned he had got carried away by the "nature of the show" while apologising for his comments on social media .
Mr Castro would be the first identical twin elected president.
Since 2012, potential candidates like Sens.
"Going forward", Castro said, America "must be the smartest, the fairest, the healthiest and the most prosperous nation on earth". Castro, who was referring to his twin brother U.S. Rep. Joaquín Castro, then repeated his candidacy in Spanish.
Castro is aware he lacks the name recognition of potential 2020 rivals or the buzz surrounding O'Rourke, whose flirtations with 2020 have tantalized donors and activists after a close race past year against Sen. He has always been viewed as a rising star in the Democratic Party since he first landed on the national scene by delivering the keynote speech for President Barack Obama at the 2012 Democratic National Convention.
WASHINGTON, DC - JULY 13: U.S. Secretary of Housing and Urban Development (HUD) Julian Castro testifies during a hearing before the House Financial Services Committee July 13, 2016 on Capitol Hill in Washington, DC.
Castro, who was considered on the short list to be Hillary Clinton's running mate in the 2016 election, has been out of the political spotlight for the past two years, at a time when politics has become all-consuming across America.
Castro and his team have signaled in the lead up to Saturday's announcement that he will lean into his Mexican-American heritage in a presidential run.
Urging his supporters to look around the blue-collar neighborhood where he grew up, Castro said, "there are no frontrunners that are born here, but... with big dreams and hard work, anything is possible in this country".
Like other Democrats running, Castro has said he will not accept money from political action committees tied to corporations and unions, and he has sought to introduce himself to voters as a champion for universal health care and affordable housing.