Democratic presidential candidate Julián Castro on Wednesday called for “tuition free” public colleges, apprenticeships and other certification programs as a way to make the U.S. workforce more competitive.

Castro, the former Housing and Urban Development (HUD) secretary, had initially called for more “accessible and affordable” higher education when he announced his candidacy, but went a step further at a New Hampshire event on Wednesday.

Tuition-free public colleges and universities is a progressive policy that Sen. Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE (I-Vt.) pushed for in his 2016 presidential campaign.

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"We need to ensure, if we want to be competitive, that every single American who wants a higher education can get one,” Castro said at a Politics & Eggs event at Saint Anselm College in New Hampshire.

“That’s why I believe that we need to work toward a tuition-free system of public university, college, apprenticeship and certification programs in this country to have the smartest, most well-prepared work force that we can in this 21st century,” he said.

During his presidential announcement speech last weekend, Castro said he supported a “Medicare for all” single-payer health care system and universal prekindergarten. At Wednesday’s event, Castro touted his work as San Antonio mayor when voters in 2012 approved “Pre-K for SA," which was covered by a sales tax increase.

“We need to make sure every single student gets off to a strong start in life, and if I’m elected president, I’m going to make pre-K for the USA happen in this country because it’s right for our students,” Castro said Wednesday in New Hampshire.

Since announcing his intention to seek the presidency, Castro made his first trip as a candidate to Puerto Rico, skipping over more traditional visits to early nominating states like Iowa.

Castro is among a quickly growing field of White House contenders including Sens. 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.) and Kirsten Gillibrand Kirsten GillibrandSuburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits The Hill's Campaign Report: 19 years since 9/11 | Dem rival to Marjorie Taylor Greene drops out | Collin Peterson faces fight of his career | Court delivers blow to ex-felon voting rights in Florida MORE (D-N.Y.). Other possible candidates still weighing a bid include Sanders and former Vice President Joe Biden Joe BidenCast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response Biden tells CNN town hall that he has benefited from white privilege MORE.