A search of Rodolfo Montoya's home turned up assault-style rifles, high-capacity magazines and hundreds of bullets, officials said.
Joseph Rubino's house contained clothing with white supremacist symbols and a purported "instruction manual for owning a slave," federal authorities said.
The presidential hopeful talked to Republican gun owners and Trump supporters on Saturday after proposing an assault weapon ban earlier this week.
“If at this moment we do not wake up to this threat, then we as a country will die in our sleep,” he said.
The former vice president helped get assault weapons banned in 1994. He'll do it again if elected president, he wrote in The New York Times.
Congressman Mike Turner represents Dayton, where a heavily armed gunman killed at least nine people and injured 27 others.
The Pennsylvania senator told Fox News that banning the military-style weapons would infringe on the rights of law-abiding citizens.
The California senator and presidential candidate said she would go after such firearms, which have been used in many mass shootings around the U.S.
Jewish students and leaders are urging Congress to ban the sale and purchase of weapons like the AR-15 assault rifle after the Pittsburgh synagogue shooting.
“I do this as a gun owner and a proud supporter of the Second Amendment," Sen. Mark Warner wrote.
The group calls for banning sales and possession of all assault-style weapons and high-capacity magazines.
Opponents to the measure have vowed to challenge the ban in court.
The gun group has worked to "perpetuate the culture of violence that we have in our country," the congresswoman said.
A U.S. District Judge ruled that assault weapons covered by the 1998 law fall outside the scope of the Second Amendment.
It is easy to get discouraged, but standing up to the National Rifle Association isn’t an impossible feat.
If politicians won't listen to gun violence survivors, we'll elect lawmakers who will.
Rep. Tulsi Gabbard says a $400 NRA donation from more than a decade ago had nothing to do with it.
From Hope Hicks' departure to Jeff Sessions' new nickname.
Why are assault weapons legal if doctors can't adequately treat the devastation they inflict?