Democrats are using a House hearing on whether IRS Commissioner John Koskinen should be impeached to raise questions about Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE’s taxes.

Rep. Jerry Nadler (D-N.Y.) declared the hearing “an obvious sham” before asking Koskinen about the Republican presidential nominee's tax returns, which he has said he will not release publicly because he is under a federal audit.

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“Is there anything that would prohibit someone from releasing their tax returns, if they want to, because they're under audit?” Nadler said, without mentioning Trump by name.

“No,” Koskinen responded.

“Can an individual use other people's money run through a charitable foundation to enrich themselves or satisfy his personal debts or obligations?” Nadler asked.

Koskinen answered that tax-exempt organizations cannot use their funds to benefit their own members.

Nadler also made reference to Trump spending $12,000 of his foundation's money to buy a football helmet signed by Tim Tebow, $20,000 for a 6-foot portrait of himself, $100,000 to cover a legal settlement and $158,000 to settle a dispute with a charity golf tournament participant.

House Judiciary Committee Chairman Bob Goodlatte Robert (Bob) William GoodlatteNo documents? Hoping for legalization? Be wary of Joe Biden Press: Trump's final presidential pardon: himself USCIS chief Cuccinelli blames Paul Ryan for immigration inaction MORE (R-Va.) objected to the question, saying it was outside the scope of the hearing.

“Additionally, it's outside the scope and expertise of the witness,” Goodlatte stated.

Koskinen declined to comment on the specific case but said nonprofit funds should not be used to benefit personal contributors.

Nadler then asked that if such a case was brought before the IRS and it failed to investigate, would it be an “impeachable” offense for the commissioner.

Koskinen said IRS commissioners don't personally make such decisions but that there is a detailed process to examine such cases.

Moments later, another Democrat, Rep. Zoe Lofgren (Calif.), asked the IRS commissioner whether an audit could be suspended during a presidential campaign.

Koskinen said commissioners don't have authority over specific audits.

Lofgren also asked whether an elected official could be charged with bribery or treason for accepting money from a foreign country — “say, Russia” — and then enacting favorable policies toward that nation.

Rep. Sheila Jackson Lee Sheila Jackson LeeHillicon Valley: Murky TikTok deal raises questions about China's role | Twitter investigating automated image previews over apparent algorithmic bias | House approves bill making hacking federal voting systems a crime House approves legislation making hacking voting systems a federal crime Lawmakers press CDC for guidance on celebrating Halloween during pandemic MORE (D-Texas) also asked whether it was appropriate for a foundation to give political donations, alluding to a $25,000 donation Trump's namesake charity gave to a political group supporting Florida Attorney General Pam Bondi. Trump paid a $2,500 fine for the donation.

Republican Rep. Darrell Issa (Calif.) acknowledged the Trump questions while taking a shot at Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE when it was his turn to speak.

“I'll refrain from asking about large nonprofits that might have taken and been influenced by foreign government contributions,” Issa said.

“That would be too sensitive to Mrs. Clinton."

Koskinen defended himself against calls for his impeachment.

The IRS chief acknowledged he had made false statements to Congress while testifying about his agency's scrutiny of conservative groups, but he said it would be “improper” for lawmakers to impeach him. He added that it would slow IRS activities.