An attorney for President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE told a federal appeals court Wednesday that Trump could not be prosecuted even if he shot someone on Fifth Avenue in New York amid a legal fight that seems destined for the Supreme Court.

Trump's personal attorney William Consovoy made the remark during oral arguments in a case involving a Manhattan District Attorney subpoena seeking Trump's tax returns and financial records from his accounting firm. The president's attorneys have argued he has blanket immunity from criminal prosecution and even investigation while in office.

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Attorneys and the three-judge panel for the 2nd Circuit Court of Appeals, all of whom were appointed by Democratic presidents, frequently referred to Trump’s assertion from his 2016 presidential campaign that he could “stand in the middle of Fifth Avenue and shoot someone” without losing supporters.

Judge Denny Chin asked Consovoy how such a scenario would work under the president’s claims of executive immunity from prosecution and investigation.

“What’s your view on the ‘Fifth Avenue’ example?” Chin asked. “Local authorities couldn’t investigate, couldn’t do anything about it?”

“Nothing could be done, that’s your position?” he added.

“That is correct,” Consovoy responded.

The case stems from a subpoena that Manhattan District Attorney Cyrus Vance issued to the accounting firm Mazars seeking the same financial records that are at the heart of separate court battles involving two Democratic-controlled House committees.

The Manhattan District Attorney's office accused Trump of "making up" claims about his tax returns and other financial records that do not exist in the law.

Carey Dunne, a lawyer with the office, pushed back aggressively against arguments that Trump's records were protected under the Constitution.

“There is no privilege for tax returns, whether it's the president or anybody else in the country,” Dunne told the judges. “Yes, he may view them as embarrassing or sensitive. But yes, tax returns do in fact get subpoenaed all the time in financial investigations.”

“They're making this up, Your Honor, that's all I can say,” Dunne added.

The judges appeared skeptical of the president's broad claims that he has a blanket immunity from criminal prosecution and even investigation while in office.

Among the records that Vance's office initially sought were those related to payments Trump had made to Stephanie Clifford — more commonly known as Stormy Daniels — and Karen McDougal in an effort to cover up the president's alleged affairs with the women prior to his time in office. Trump has denied being involved with Clifford or McDougal.

Trump's lawyers asked a federal district court judge to block the subpoena that was filed in state court. Earlier this month, the district judge dismissed the request and blasted the president's argument that he "enjoys absolute immunity from criminal process of any kind." The president's attorneys quickly appealed the ruling.

The case has indeed progressed more rapidly than Trump’s legal battles with Congress. The House Ways and Means Committee’s effort to obtain the president’s federal tax returns is still unfolding in the D.C. District Court, as is the president’s lawsuit against members of Congress and New York officials over a recent law in that state allowing Congress to obtain the president’s returns.

Earlier this month, the D.C. Circuit Court of Appeals ruled in favor of the House Oversight and Reform Committee’s effort to subpoena Mazars in another case that could reach the Supreme Court.

Vance and Trump's lawyers have agreed to expedite their case in an effort to fast-track it to the Supreme Court. Vance said that his office would not enforce the subpoena while the legal battle plays out.

Robert Katzmann, the chief judge for the 2nd Circuit, acknowledged that the fight will likely move to the nation’s highest court.

“This case seems bound for the Supreme Court,” Katzmann said.

“I think both sides see that as an inevitability, Your Honor,” Dunne responded.

--Updated at 1:14 p.m.