Biden last month tapped Chipman, a former federal agent, and adviser at the gun control group Giffords, to be director of ATF.
Fox News received a letter from House Republican Study Committee Chair Jim Banks, R-Ind., and 68 other House GOP members written to Senate Majority Leader Chuck Schumer, D-N.Y., and Senate Minority Leader Mitch McConnell. R-Ky., on Monday.
In the note, the GOP members described Chipman as a "longtime gun control activist and lobbyist."
"His beliefs and hostile attitude toward the rights of gun owners are well known," the letter wrote. "Thus, we respectfully ask that you oppose his confirmation."
Republicans cited Chipman's record, saying that in October 2018 he fought in favor of reducing all AR-15s and potentially all semi-automatic rifles to control under the National Firearms Act.
"As a former agent of the ATF, Chipman knows all too well that such action would effectively ban the most popular rifle in America as well as most other items regulated under the National Firearms Act," they wrote. Republicans argued that Chipman’s confirmation would "threaten the landscape of firearm ownership for generations of Americans to come."
"If confirmed, David Chipman would use every tool at his disposal to attack American gun owners and we respectfully ask you to oppose any and all action that would advance his confirmation in the Senate," they wrote
At Giffords, Chipman spent much effort pushing for greater supervision and enforcement on ghost guns, modifications to the background check system and steps to reduce the acquisition of illegal firearms.
Chipman spent 25 years as an agent at the ATF. During his work, he worked on ending a trafficking ring that sent illegal firearms from Virginia to New York and served on the ATF's SWAT team. Chipman is a gun owner, according to the Associated Press.
The ATF is a law enforcement agency within the Department of Justice that pushes to safeguard the public from criminal groups and activity, including the illegal use and trafficking of firearms.
Biden called Chipman last month – the same day he rolled out a set of executive orders on gun control.
The White House said Chipman will respect the Second Amendment while he enforces gun laws.
The president has said he backs an assault weapons ban, voluntary buybacks of assault weapons wants to revoke a law that prevents gun manufacturers from being sued for crimes people commit with guns, and much more.