Former Housing and Urban Development Secretary Julián Castro appealed to supporters on Monday to donate $800,000 by Oct. 31, saying he would be forced to end his presidential campaign otherwise.

Castro tweeted out the call for donations Monday, saying, “This is a critical moment— if my campaign can’t raise $800,000 by October 31st, my campaign will be silenced for good.

The tweet included a video lauding Castro for “saying what no one else would,” citing his call for decriminalizing crossing the U.S. border and warning “we’re in danger of losing Julián’s voice.”

I’m extremely proud of the historic and bold campaign we have built together.



But this is a critical moment— if my campaign can’t raise $800,000 by October 31st, my campaign will be silenced for good. Help us keep up the fight.



DONATE now: https://t.co/CZKqZ7uYHM pic.twitter.com/opXiNoDn3I — Julián Castro (@JulianCastro) October 21, 2019

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Sen. Cory Booker Cory Anthony BookerThe movement to reform animal agriculture has reached a tipping point Watchdog confirms State Dept. canceled award for journalist who criticized Trump 3 reasons why Biden is misreading the politics of court packing MORE (D-N.J.) tried a similar tactic in September, warning that without $1.7 million in donations, “we do not see a legitimate long-term path forward.” The appeal was successful, with the Booker campaign raising $1.78 million over the next nine days.

“This moment is a testimony to the power of what’s possible when people unite in common purpose and work toward a shared goal,” Booker wrote in September.

Castro polls at an average of 0.8 percent in the crowded Democratic field, according to the RealClearPolitics average of presidential primary surveys, but has driven interest with a series of widely-watched moments in the primary debates, including a confrontation with former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE at the September debate.