Organizers expected more than 10,000 to attend the Tax March in Washington, DC, and many more to gather in New York City, where crowds will pass Trump Tower, the president's high-profile Manhattan property. After Trump supporters said they would hold a "Patriot Day" rally, counter-protesters chose to hold a rally at the same place.
"Despite intense public pressure, President Trump has not yet done so - breaking with 40 years of precedent in the process", said a statement on the Tax March website.
"If he's got nothing to hide, he should release his tax returns", said protester Liz Turner, 31.
The atmosphere was festive on Saturday at a downtown Chicago rally where a sousaphone band played and rally goers chanted.
By noon, most of the anti-Trump protesters emptied onto Allston Way bordering the park. "People didn't care. They voted for him", she said on ABC News' "This Week".
Saturday, the Electronic Privacy Information Center filed a lawsuit against the IRS for failing to release the president's tax returns in response to a Freedom of Information Act request. Organizers said Saturday's protests, dubbed the Tax March, were scheduled in almost 150 cities, and stemmed from the women's march that took place the day after Trump's inauguration. "We march because it is in the best interest of the American people to know what financial entanglements and conflicts of interest our leaders have". We have no idea what his connections are to another government.More news: Modi To Launch BHIM-Aadhaar Facility For Merchants At Nagpur
"We all are very interested in not only where this president had business ties and who he is beholden to, but why he refuses to show us", Silverman said.
President Donald Trump's motorcade took a circuitous route back to Mar-A-Lago after he spent Saturday morning at his golf course, avoiding Tax Day protesters headed toward his Palm Beach estate.
In Berkeley, California, police said more than 10 were arrested after participants at a "Patriot's Day" rally clashed with demonstrators from an anti-fascist counter protest. But Trump's full returns would contain key details about things like his charitable giving, his income sources, the type of deductions he claimed, how much he earned from his assets and what strategies Trump used to reduce his tax bill.
Progress NC Action has collected nearly 6,000 petition signatures supporting the Trump Act, which would require Presidential candidates to release five years of tax returns in order to appear on the ballot in North Carolina. Ron Wyden, D-Ore., said, Americans have "a basic right to know whether the president pays his fair share". Asked her thoughts on an online petition demanding Trump release his tax returns, Conway replied that the White House would not release his tax returns and the issue was of little concern to Americans.
Check out the masses that turned out and some of the signs protesters brought to the Tax March below.
Democratic U.S. Sen. Elizabeth Warren, of MA, on Friday posted an online video urging Congress to force Trump to release the returns.