The town hall was scheduled to begin at 7 p.m., but by 5:15 p.m., people were already lined up around the building - many of them holding signs asking when Chaffetz will investigate the President Donald Trump's tax returns, or questioning the president's immigration policies.
Rep. Jason Chaffetz of Utah told reporters that before he even sat down in the Oval Office, "The president said, 'No oversight".
One woman was arrested and put into handcuffs on Thursday evening at a high school in a Salt Lake City suburb.
Chaffetz is expected to face some sharp questions during the town hall from frustrated constituents.
Chaffetz had promised before the election that he would investigate Democrat Hillary Clinton for years.
The main complaints among the crowd Thursday at a high school in a Salt Lake City suburb were that the Republican congressman is not doing what is best for the state's natural resources and that he needs to investigate President Donald Trump's ties to Russian Federation.
Holly Cobb Robinson from Salt Lake City said repealing the monument would result in more drilling and mining for coal, which would destroy the land. Period. That's the reason why Jason Chaffetz is in Congress, which is to investigate Democrats.
"You're really not going to like this part", Chaffetz responded.
Utah lawmakers asked Chaffetz if he'd use his role as the powerful chairman of the House Oversight Committee to investigate Trump's business interests.
But the oversight chairman indicated that he would not pursue investigations into Trump's potential conflicts of interest.
Chaffetz told Utah lawmakers that Trump immediately raised the issue of Utah's Grand Staircase-Escalante National Monument, which has blistered Utah Republicans and locals since it was declared two decades ago. Chaffetz said he doesn't want to get into a "fishing expedition" just because Democrats think he should. Chaffetz say he hopes Zinke will visit soon after he's confirmed.
Chaffetz did say that when he spoke with Trump at the Republican retreat in Philadelphia last month, the President did not try to deter him from conducting oversight.
"We should know a few things about being a religious minority", he said.
Chaffetz and most legislators belong to The Church of Jesus Christ of Latter-day Saints.
It looks like the more than 1,000 people who showed up at the Brighton High School Thursday night want him to do more.
"We have a major problem here in Salt Lake Valley, with the inversion", Chaffetz said.
Muslim leaders told the congressman that people stuck in refugee camps aren't safe and that the ban caused great anxiety among Muslim-Americans.
Stanley M. Brand, a lawyer at the firm Akin Gump who defends the rights of witnesses involved in government investigations, said he expects the rule to be tested during the Trump administration.