After Attorney General William Barr sent a letter to Congress Sunday saying that Special Counsel Robert Mueller's investigation did not find evidence that President Donald Trump's 2016 election campaign "conspired or coordinated" with Russia, several Massachusetts Democrats tweeted their outrage and demanded the full report be made public.

"Congress voted 420-0 to release the full Mueller report. Not a 'summary' from his handpicked Attorney General. AG Barr, make the full report public. Immediately," Sen. Elizabeth Warren tweeted shortly after Barr's letter to Congress was made public.

Read more:DOJ: Trump Campaign Did Not Coordinate With Russia In 2016

"You should not write a book report from Cliff’s Notes, and Congress should not make any final determinations from one summary. We need the full Mueller report and underlying documents," Sen. Ed Markey tweeted. "I want to read it all and so do the American people. Make it public."

Read more: Read Attorney General William Barr's Full Letter To Congress

"Every American deserves to know how our country was attacked and how our leaders responded. Only then can we restore our collective confidence in our system," Rep. Joe Kennedy tweeted later Sunday afternoon.

Rep. Jim McGovern also called for the full report to be made public, adding that "Nothing less will do."

Rep. Richard Neal also urged Barr to "respect the wishes of the American people & Congress and release the full report," tweeting, "This process must be open, public and transparent."

"We received Cliff Notes from the President’s AG, not the full story," Rep. Katherine Clark tweeted. "The Mueller report must be made public, including the underlying investigative materials, and the House must continue its constitutional duty of oversight. #ReleaseMuellerReport."