President Trump on Sunday suggested that the thousands of Tax Day protesters in cities across the country over the weekend were paid, and he called for "someone" to investigate who funded the effort.

In Berkeley, California, police arrested at least 20 people at unrelated gatherings of about 200 pro- and anti-Trump people in a park after fist fighting erupted. "The election is over!" She and a friend rode a bus from New Jersey to New York City to take part in protests.

The demonstrations came on the date taxpayers traditionally have to file their returns by and just days before this year's filing deadline Tuesday.

Others helping organize the events Saturday included labor unions and activist groups such as MoveOn.org and Common Cause.

From there, at 9:07 a.m., Trump dove into a subject near and dear to his heart: His electoral college win.

Later, Spicer was asked whether the White House would say that Trump would never release his tax returns.

I know this because on Sunday the president tweeted: "Happy Easter to everyone!"

Trump has made similar claims before: first on November 10, following his presidential win, when he said that it was "very unfair" that 'professional protesters, incited by the media, are protesting, ' and again on February 3, after passing his first executive order on immigration. Audits do not prevent the release of tax returns.

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For the past 40 years, every USA president and presidential candidate has released tax documents.

Asked Monday whether the president will ever release any of his previous tax returns, Spicer said, "We'll have to get back to you on that". It has legal authority to obtain confidential tax records, and could vote to make them public.

"I have very big returns, as you know, and I have everything all approved and very handsome and we'll be working that over in the next period of time, Chuck", Trump said.

But it's unlikely they'll see returns anytime soon - if at all.

Demonstrators who participated in Tax Day protests across the country Saturday say that's not enough.

The public's demand to see Trump's tax returns will not end.

Toting handmade signs, marchers shouted their discontent regarding the current administration's transparency and potential conflicts of interest due to Trump's worldwide business ties.

While some may consider this debate long over and fruitless, the reality is that a whopping 80 percent of Americans want the President to increase his transparency by releasing his tax returns.