Volunteers interested in helping elect Donald Trump may want to read the fine print about what a role on the Republican presidential candidate’s campaign really means. The Trump campaign now requires online volunteers who want to make phone calls on behalf of the candidate to sign a wide-ranging 2,271 word non-disclosure agreement promising not to say anything disparaging about Trump, his family, or any related company, “and to prevent [their] employees from doing so.” The non-disparagement clause covers the duration of the volunteers’ service “and all times thereafter.”

CNN contributor Rachel Sklar posted portions of the NDA to Twitter Friday, noting that “even by the grossly permissive standards of Citizen’s United, coercing your employees is completely illegal," meaning an employer who volunteers for the Trump campaign would have no legal ground to stop their employees from disparaging the Republican candidate. Sklar called the wording “coercive and illegal.”

But the scope of the NDA doesn’t end there. The agreement essentially binds volunteers to the Trump campaign for the duration of the election, requiring signers to promise not to assist “any person that is a candidate or exploring candidacy for president of the United States other than Mr. Trump and to prevent [their] employees from doing so.” It also expressly forbids volunteers from hiring any person who provides service to other campaigns.

The Daily Dot first reported that volunteers and staffers for Trump must sign detailed NDAs in March. “I guess he doesn't know about the First Amendment,” employment lawyer Davida Perry told the online newspaper. “This is really shocking.”

“He's apparently so afraid that people would say something bad about him after spending some time on his campaign that they have to sign some sort of agreement,” Perry added.

Trump has a longstanding reputation for requiring his employees and aides to sign agreements; he even once sued his ex-wife Ivana for $25 million accusing her of the “willful, deliberate and surreptitious disclosure” of personal details despite agreeing not to speak publicly about their relationship. In July, Trump sued a former campaign consultant for $10 million, alleging the staffer violated the NDA.

The Republican candidate’s requirement for volunteers is certainly unique among campaigns. “It’s not a typical procedure,” Matt Moore, chairman of the South Carolina GOP, told cincinnati.com, adding that they sometimes require volunteers to sign NDAs in the interest of protecting private information and maintaining database security. Rival Hillary Clinton has no such NDA for her campaign's volunteers.

Trump campaign spokesman Seth Unger deflected questions on Friday about the importance of such agreements for online volunteers. ”We are running a state-of-the-art campaign for Mr. Trump that involves best-in-market volunteer platforms, and it is attracting thousands of volunteers who are tired of the same old Washington corruption and backroom deals and are securing votes for a change in November,” Unger told cincinnati.com.