As Congress works to pass a spending bill by Friday night to avoid a government shutdown, legislators in Washington D.C. have been met with protesters and letters from people showing their support for the Deferred Action for Childhood Arrivals (DACA) and other issues.

Ozark Indivisible, an Arkansas-based activist group, tweeted Wednesday an image of a cease and desist letter sent to one of Cotton's constituents.

In the brief letter, Cotton's office asked the person that "all communication" must be stopped with any of his offices. Any further contact by the person would be considered harassment and would be reported to the U.S. Capitol Police. Caroline Rabbit Tabler, Cotton's communications director, said that these letters are rare and only used "under extreme circumstances."

"If an employee of Senator Cotton receives repeated communications that are harassing and vulgar, or any communication that contains a threat, our policy is to notify the U.S. Capitol Police's Threat Assessment Section," Tabler said.

In an Arkansas Times article, the person who reportedly received the letter said they have called other legislators to express their "strong thoughts and opinions about their actions."

"They obviously don't want to be held accountable for their words and actions while serving all the people in this nation," the person said.

The person admitted that they may have used "unprofessional and unbecoming language" to "vehemently express" their "righteous anger at Senator Cotton's complicitness with this harmful regime."

Cotton has been a proponent of strict immigration reform, but recently has been in the middle of controversy when President Donald Trump allegedly called some African nations "sh*thole countries."

In a recent interview on Face the Nation, Cotton said America's immigration system "rewards ties of blood, ties of kin, ties of clan."

"That's one of the most un-American immigration systems I can imagine," Cotton said. "That's why we're trying to fix it."

A CBS News poll found that nearly nine in 10 Americans support young immigrants staying in the country who were brought to the country illegally as children.

A previous version of this article had a section about protesters in Washington D.C. which can be found here in a separate article.