However, the IRS stated that Trump is allowed to release his tax returns even while under audit.
The testy town hall exchange comes on the heels of nationwide Tax Day protests in which activists demanded the president to finally release his tax returns and disclose his financial entanglements to the American public.
During the campaign trail, President Trump promised to release his tax returns but after 86 days in office, he has yet to do so.
"We'll have to get back to you on that", Spicer said.
He will fight the protesters and anyone who thinks his tax returns should be public.
"I did what was an nearly an impossible thing to do for a Republican-easily won the Electoral College!" he tweeted.
He suggested that Americans could derived what they needed to know about the president's finances from the decade-old documents that were provided to Johnston by an anonymous source.
But it's unlikely they'll see returns anytime soon - if at all. "Now Tax Returns are brought up again?"
"You know, the only one that cares about my tax returns are the reporters". Not only does the country deserve to know which countries he is financially beholden to, but he is also in charge of overseeing the US economy and crafting tax policy. Being under audit does not prohibit tax returns from being released.
The demonstrations were timed to coincide with the traditional April 15 deadline for annual tax filings, a key date on the calendar for U.S. households, and resulted in dozens of arrests.
Images of tax protesters in cities including Washington, Philadelphia, Chicago, Los Angeles and NY flooded social media. "The American people understood when they elected him in November".
Seventy-one-year-old Ilene Singh said he's wrong.
'Someone should look into who paid for the small organised rallies yesterday.
But I wonder if the tax return-hungry left hasn't fallen into the trap of believing that most of what Trump says and does doesn't really count.
When Congress returns from its recess next week, the president will face his next legislative battle and rewrite the tax code.
Denham went on to reference the single year of Trump's returns that was recently leaked, and said, "it appeared he paid more in taxes than any of the previous presidents".
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