"Do you consent to a president who refuses to provide financial transparency?" asked organizer Stacy Hughes, standing next to the chicken. "No!" the crowd replied.
"Do you care?" she said. "Yes!" they shouted.
"That's why we're here, in good ol' red state Utah," Hughes said.
The rally also served as a chance to vent about other Trump administration policies and voice frustration with Utah's congressional delegation.
Two speakers at the rally plan to run against Rep. Mia Love in 2018 Thomas Taylor and Darlene McDonald. Another, Kathryn Allen plans to take on Rep. Jason Chaffetz.
Taylor said he became distraught after Trump's election and decided to jump in the race against Love. His daughter was in the crowd handing out flyers that read "Fight Trump's Corruption."
Taylor said he is worried the Trump administration and family is "selling access to the U.S. president" and using the position of power to boost the profile of the Trump brand.
"I want to have a time when our government is boring again," Taylor said, acknowledging it has been difficult to keep up with the steady stream of controversial Trump news.
Signs and speakers mentioned immigration, the Russians, air pollution and Bears Ears National Monument. Some attendees wore paper chicken beaks on their faces. Others wore the well-known pink handwoven "pussyhats," an anti-Trump symbol that gained notoriety during women's marches following the inauguration.
Wally Barnum held a sign that said Trump was the "worst president ever." He said it was important to keep pressuring Trump to release his tax returns.
"I believe in transparency in government," Barnum said.
Standing nearby, Linda Wheatley held a sign that read, "Subpeona Trump's Taxes."
"What's he hiding?" Wheatley said. "We don't know," she said, unless he is required to release his returns.
Midway through his speech, Taylor brought up the Emoluments Clause of the Constitution, meant to prevent presidents and other American officials from being corrupted by payments from foreign governments.
Some already have accused Trump and his businesses of violating the clause.
"Lock him up!" the crowd began to chant in unison.