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-Texas) defended his charitable giving on Tuesday after facing questions about his donations by a voter on the campaign trail.

After releasing 10 years' worth of tax returns, O'Rourke was asked about his charitable giving rate — 0.3 percent — from a student at the University of Virginia, where the former congressman appeared on Tuesday, according to the Dallas Morning News.

O'Rourke paid $81,019 in income taxes in 2017, according to his returns, while reporting $1,166 in charitable donations.

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"There are charities that we've donated to that we've recorded and itemized, others that we've donated to that we have not," O'Rourke reportedly responded.

"I'll tell you, I'm doing everything I can right now, spending this time with you, not with our kiddos, not back home in El Paso, because I want to sacrifice everything to make sure that we meet this moment of truth with everything we've got," he continued.

O'Rourke and other Democratic candidates have publicized the release of their tax returns in recent days as President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE continues to resist pressure to release his own returns. The president bucked tradition in 2016 by refusing to release his returns, claiming to be under IRS audit.

O'Rourke faces a crowded field of Democratic contenders vying for the party's 2020 presidential nomination, and trails other candidates such as Sen. Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE (I-Vt.) and South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegThe Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice Hillicon Valley: FBI, DHS warn that foreign hackers will likely spread disinformation around election results | Social media platforms put muscle into National Voter Registration Day | Trump to meet with Republican state officials on tech liability shield MORE (D) in polls of early primary states.

O'Rourke was also found this week to have underpaid his taxes in 2013 and 2014 by more than $4,000 in those two years. A spokesman told The Wall Street Journal, which originally reported the discrepancy, that an amendment would be filed by the accounting firm that prepared O'Rourke and his wife's taxes.

"After becoming aware of this error, the accounting firm that prepared the filings was immediately informed and will file an amendment as appropriate,” the spokesman said.