Former Housing and Urban Development (HUD) Secretary Julián Castro (D) announced Saturday that he will launch a bid for the White House in 2020.

"I am a candidate for president of the United States of America," he said during a speech in his hometown of San Antonio, where he served as mayor until 2014.

Castro, 44, had long been rumored to be in the running for president, after sitting out the 2018 Texas gubernatorial and Senate elections.

The former Obama-era housing chief announced last month that he was forming an exploratory committee for a possible 2020 run. If elected, he would be the country's first Hispanic president.

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Castro used his speech Saturday to cast himself as a progressive candidate on issues such as health care and climate change, while blasting President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE over his immigration policies and moves at the border.

"There is a crisis today, it's a crisis of leadership. Donald Trump has failed to uphold the values of our great nation," he said.

Castro also rebuked the president's attacks on the press, thanking members of the media who attended the rally and calling the press "the friend of the truth" in America.

The former Obama administration official said that if elected his first executive action would be to "recommit the United States to the Paris climate accord," referring to the 2015 deal from which Trump withdrew the U.S.

He also pledged support for other progressive positions, including a "Medicare for all" single-payer health care system as well as universal prekindergarten in the U.S.

Rep. Joaquin Castro Joaquin CastroHispanic Caucus members embark on 'virtual bus tour' with Biden campaign Hispanic caucus report takes stock of accomplishments with eye toward 2021 Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-Texas) acknowledged in introducing his twin brother Saturday that he would join a crowded Democratic field, but pitched him as the best option.

"I know that with your help and support we have the best candidate with the best ideas and the biggest heart," he said.

Republicans were quick to knock the Democratic candidate, issuing a statement calling him a "lightweight."

"Julián Castro has made history by becoming one of the biggest lightweights to ever run for president. He was a weak mayor who couldn’t even handle being HUD secretary. This is obviously just another desperate attempt to become someone else’s running mate," Republican National Committee spokesman Michael Ahrens said.

The timing of Julián Castro's announcement coincided with two important conventions in the Latino political world.

Bold PAC — the Congressional Hispanic Caucus's (CHC) campaign arm — and the Latino Victory Fund hold their conventions in Puerto Rico this weekend. Joaquin Castro is the chairman of the CHC.

The Latino vote's stock in Democratic primaries is up for 2020, as primary date shifts have favored the growing demographic.

Latino voters will play a key role in the early Nevada caucuses, as well as Texas and California — the states with the nation's two biggest Latino populations.

He joins what's likely to be a crowded Democratic presidential field.

Rep. Tulsi Gabbard Tulsi GabbardRepublicans call on DOJ to investigate Netflix over 'Cuties' film Hispanic Caucus campaign arm endorses slate of non-Hispanic candidates Gabbard says she 'was not invited to participate in any way' in Democratic convention MORE (D-Hawaii) said Friday that she has decided to run for president in 2020. Sen. Elizabeth Warren Elizabeth WarrenWarren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon No new taxes for the ultra rich — fix bad tax policy instead MORE (D-Mass.) announced an exploratory committee for 2020 and others, such as Sen. Kamala Harris Kamala HarrisScott Walker helping to prep Pence for debate against Harris: report California family frustrated that governor, Harris used fire-damaged property for 'photo opportunity' Moderna releases coronavirus vaccine trial plan as enrollment pushes toward 30,000 MORE (D-Calif.), are expected to jump in soon.

Julián Castro could face some home-state competition, as former Rep. Beto O'Rourke Beto O'RourkeJimmy Carter says his son smoked pot with Willie Nelson on White House roof O'Rourke endorses Kennedy for Senate: 'A champion for the values we're most proud of' 2020 Democrats do convention Zoom call MORE (D), who narrowly lost his bid to unseat Sen. Ted Cruz Rafael (Ted) Edward CruzLoeffler calls for hearing in wake of Netflix's 'Cuties' Health care in the crosshairs with new Trump Supreme Court list 'Parks and Rec' cast members hosting special reunion to raise money for Wisconsin Democrats MORE (R) in November, is widely believed to be considering a run for the White House.

– John Bowden contributed

Updated: 2:11 p.m.