Trump has said that voters don't care about his tax returns.
"Without seeing his taxes, we'll never really know who he's working for", said Dinkin, who expects the marches to draw at least 100,000 protesters.
"Thanks to Trump, I think that releasing your taxes when you run for president now has to be a law", said New Yorker Marni Halasa, 51, who arrived in a tutu and leggings made of fake dollar bills and holding a sign that read "Show Me The Money!"
Marches are planned Saturday in Raleigh, Charlotte and Mooresville on the day Americans normally must complete their annual tax returns.
Registered nurse Pam Craig, of Greensboro, North Carolina, says she'd like to ask Trump how much he "contributed to this country".
Chuck Schumer, D-New York, said Trump's refusal to release his tax returns will make it harder for Congress to pass a tax reform deal, which is a top GOP priority. Trump's break with precedent has raised questions about possible conflicts of interest. Protesters took to the streets in dozens of cities nationwide Saturday to call on.
ALLEN: In West Palm Beach, several hundred protesters marched along the Intracoastal Waterway to a bridge just a few hundred yards from Trump's Mar-a-Lago resort, including Robert Saplin of Tamarac, Fla.
Two of the biggest Tax rallies took place in NY and Los Angeles, where witnesses said about 5,000 people were present in each cities, demanding the president to release his taxes. "It's a routine one that continues", White House press secretary Sean Spicer said Monday.
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The comments com after American TV channel MSNBC revealed it had seen a tax return summary for the billionaire tycoon for 2005. Actress Debra Messing, comedian Sarah Silverman and U.S. Rep. Hakeem Jeffries were among the protesters.
A resident at Cotton's town hall Monday said that Trump's tax returns would expose his overseas interests - a hint at the central role Trump's tax returns have taken in the continuing investigations into Russia's meddling with United States elections.
Trump was the first major-party nominee in more than 40 years not to release his tax returns and he reneged on a campaign commitment to release them.
In a Quinnipiac University poll released on April 4, more than two-thirds of the respondents said Trump should publicly release his tax returns.
The marches were launched by a single tweet, organizers said. The Oregon Democrat and says the people have "a basic right to know whether the president pays his fair share".
The march was held on the traditional April 15 deadline for the U.S. federal tax returns, the filing however has been pushed back by two days. "We the People of Milwaukee intend to hold him accountable in the name of transparency and good governance", said Brian Eisold, rally organizer for the Milwaukee Tax Day.
Joe Dinkin, spokesman for the Working Families Party, one of the groups organizing the marches, said investigations into the Trump campaign's alleged connections to Russian Federation underscore the need to disclose his returns.