"I did what was an nearly impossible thing to do for a Republican- easily won the Electoral College!" Now Tax Returns are brought up again?' Trump wrote.
Trump has refused to release his tax records, claiming the public doesn't care.
Thousands of protesters gathered across the USA on Saturday for the Tax March calling Trump release his taxes.
The demonstrations came just days before the deadline for taxpayers to file their returns.
His messages came after thousands of protesters gathered Saturday in cities across America to pressure Trump to release his tax returns, a move of transparency he has repeatedly rejected.
"Releasing your tax returns is the lowest ethical bar for a president", Sen.
But 71-year-old Ilene Singh said he's wrong.
Thousands turned up to protests in New York, Chicago, Los Angeles and Washington, DC. "We need a president who works for all Americans - and a tax system that does, too", said the organisers of the "Tax March" demonstrations on its website.
In Berkeley, California violent clashes erupted between Trump supporters and opponents.
"I'm actually hoping to find out that he has no questionable business dealings", said Lisa Curwen. Lisa Saunders and Brittany Patterson said they were active with the local chapter of Indivisible, an anti-Trump group.
A day after the massive January 21 women's march in Washington and other cities, comedy writer Frank Lesser tapped out on Twitter, "Trump claims no one cares about his taxes". Trump's break with tradition has raised questions about possible conflicts of interest.
'"If you release them and you're not hiding anything, the American people can feel rest assured that at least our democracy is protected".
Presidents are under no obligation to release tax returns, and Trump has shown no intention of making them public.
San Francisco Supervisor Jane Kim also spoke at the march and stressed that although the president's tax returns is an important issue, we must look at the bigger picture.
"We do care. We want to see his taxes", said Ann Demerlis, who was among hundreds who marched in Philadelphia.
Republicans also have rebuffed Democrats' efforts to get the House Ways and Means Committee to act.