Republican leaders have shown little interest in new gun legislation, following the February 14 attack at a Parkland, Florida, high school, according to the Times.
Hoffman wrote, "For how many years now have we been doing this - having these experiences of terrorism, mass killings - and how many years has it been that nothing's been done?"
Hoffman Jr. said he would only offer further support to the GOP if lawmakers pass an all-out ban on assault rifles in the United States.
When challenged that the National Rifle Association could make up in financial contributions to GOP politicians who may no longer receive backing from Hoffman, the Republican mega-donor said he didn't care about the gun-rights organization.
Hoffman has previously donated millions to Republican candidates such as ex-Florida Gov. Jeb Bush and former President George W. Bush. The party, which has full control of both the state and federal government, has traditionally opposed virtually all new limitations on firearms. The attack killed 17 people and left 14 others injured.
"I will not write another check unless they all support a ban on assault weapons", he wrote in the email to The New York Times.
Gunman Nikolas Cruz used an AR-15 to shoot up Marjory Stoneman Douglas High School in Parkland, Fla., killing 17 people.
In a news conference Wednesday night, Scott declined to say whether policymakers should take a stand on gun control, insisting that "there's a time" to have such discussions.
Republican lawmakers in Florida have pushed back on gun control initiatives, despite the state being the site of the 2016 Pulse Nightclub shooting in Orlando - the second-worst mass shooting in US history that left 49 dead.
Legislators in CT significantly expanded an existing ban on the sale of assault weapons, prohibited the sale of magazines with more than 10 rounds and required the registration of existing assault rifles and higher-capacity magazines. His comments provoked outrage among some students who survived the shooting. Those included Florida Gov. Another Florida-based GOP donor who has already signed on to Hoffman's plan, Peter S. Rummell, told the Times that after the Parkland shooting, gun control "has to start somewhere".
Even on its own, Hoffman's money will be missed.
Campaign records show he gave $25,000 to the Senate Leadership Fund, a group tied to Senate Majority Leader Mitch McConnell (R-Ky.), in April 2017.