Volunteers for Donald Trump's campaign have to sign an agreement that would prevent them from saying anything bad about the GOP nominee, his family, companies or products – for life.

The Trump campaign requires people who want to make phone calls on Trump's behalf to sign a lengthy nondisclosure agreement that prohibits volunteers from criticizing the candidate and his brands, a broad, but not illegal demand, according to experts.

The form , which is 2,271 words long, demands volunteers go so far as to ban their employees – who are not even involved with the Trump campaign in any way – from disparaging him or volunteering for Hillary Clinton, neither of which they can legally require, experts say.

According to the Cincinnati Enquirer , anyone who signs up online to use Trump Red Dialer, the campaign's online system that connects volunteers to a list of potential voters to call, must sign the form.

In March, the Daily Dot noted people showing up to make calls from the campaign office at Trump Tower in Manhattan were required to sign a nondisclosure agreement in person. But the online form, which the Enquirer noticed after Trump Red Dialer was promoted to Ohio volunteers in a campaign email Tuesday, is unusual in that it enforces silence even to those who may never meet Trump or any of his family members, or ever step foot on one of his properties.

While it does allow volunteers to work for other campaigns after this election ends, the nondisparagement clause doesn't expire even if Trump is no longer a candidate for political office.

Rachel Sklar, a lawyer and CNN contributor, pointed out the extraordinarily broad and legally murky nature of the agreement, explaining that "it's written to protect all of Trump's family and enterprises and anything created to benefit same."

(5) It's written to protect all of Trump's family and enterprises and anything created to benefit same. Broad AF! pic.twitter.com/sq4Wt5pKXx — Rachel Sklar (@rachelsklar) September 2, 2016

(7) Even by the grossly permissive standards of Citizens United, coercing your employees is completely illegal. pic.twitter.com/rV69hba0re — Rachel Sklar (@rachelsklar) September 2, 2016

(8) No, you can't prevent your employees from volunteering for Hillary. Coercive and illegal! pic.twitter.com/ZoIXjm6pBA — Rachel Sklar (@rachelsklar) September 2, 2016

(13) Never say anything bad about a "Trump Person" forever and ever! pic.twitter.com/0b8KUQeRfU — Rachel Sklar (@rachelsklar) September 2, 2016