Protests have been taking place in more than 150 locations across the United States to call on President Donald Trump to Discharge his tax returns.
Mr Trump broke a long-held tradition by not releasing his paperwork during his presidential campaign.
His critics want to know who he has been dealing with in addition to if there are any conflicts of interest.
At least 21 people were arrested in Berkeley, California, in clashes between Trump opponents in addition to supporters.
There is actually no law requiring presidents to Discharge their tax returns, although Mr Trump has found himself under public pressure in addition to some information through a 2005 tax return was leaked to the media last month.
The protests were timed to coincide with the traditional mid-April deadline for Americans to file their tax returns.
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“I think in which is actually critical we know about his investments, his donations in addition to any entanglements he has,” said one protester, Chuck Wash, at a march in Washington DC.
The idea for the themed march came through law professor Jennifer Taub, who was angered when presidential adviser Kellyanne Conway said President Trump would certainly not be releasing his tax returns because “people don’t care”.
In January, Ms Taub tweeted of the need for a nationwide protest to show the president in which many people do care.
The idea quickly caught on.
“I wanted to express myself in addition to never in my wildest dreams did I think I would certainly be standing here today, seeing This kind of idea in which I tweeted out in January come to life,” she told the BBC at the Washington DC march.
Ms Taub said the march had broader aims than just wanting to see the president’s paperwork.
“This kind of is actually also about having a tax system in which is actually fair,” she said. “Both in terms of generating sure everyone pays their fair share in addition to also in taking public resources – our taxes – in addition to spending them on things in which make everyone flourish.”
She said less should be spent on wars, in addition to more should go to public service television in addition to the Meals on Wheels programme, which Mr Trump has made funding cuts to inside first months of his presidency.
Congresswoman Maxine Waters, a Democrat through California, was also at the march in Washington DC.
She said the Trump administration includes a “huge” transparency problem.
“He [Trump] talked about draining the swamp in addition to generating everything transparent. He lied again,” said Ms Waters.
She also criticised Friday’s announcement in which President Donald Trump will not Discharge the logs of those who visit the White House.
The White House cited “grave national security risks in addition to privacy concerns” as the reason for its decision, reversing former President Barack Obama’s voluntary disclosure policy.
Participants used the hashtag #showusyourtaxes to share their images on social media.
President Trump’s supporters have also gone online to express their support for the president.
One Twitter user accused protesters of “flogging a dead horse” in addition to many said they had no interest in seeing the returns.
Separately, more than a dozen people were arrested in Berkeley, California, after supporters of Mr Trump clashed with anti-fascist demonstrators at a free speech rally, police said.
Several people were injured when fighting broke out at a park inside city as opponents in addition to supporters of the US president met on the streets during Saturday’s protests, according to CNN.
Footage shared on social media showed crowds of people throwing items at one another in addition to demonstrators being attacked with what appeared to be chemical sprays in addition to makeshift weapons.
The incident occurred after hundreds of anti-Trump protesters staged a counter-rally alongside an event billed as a “Patriots Day free speech rally in addition to picnic”, organised by the president’s supporters.