DENVER (AP) 鈥 This week鈥檚 confrontation that ended with FBI agents fatally shooting a 74-year-old Utah man who threatened to assassinate President Joe Biden was just the latest example of how violent rhetoric has created a more perilous political environment across the U.S.

Six days earlier, a 52-year-old was sentenced to three-and-a-half years in prison for threatening to kill Arizona election workers. Four days before that, prosecutors charged a 56-year-old for lying to buy guns for her mentally ill adult son, who threatened to use them against Biden and that state鈥檚 Democratic governor.

Threats against public officials have been steadily climbing in recent years, creating new challenges for law enforcement, civil rights and the health of American democracy.

The Capitol Police last year reported that they investigated more than double the number of of Congress as they did four years earlier. Driven by former President that the was stolen from him, have exploded, with one in six reporting threats against them and leaving the job or considering it.

鈥淚t's definitely increased in the last five years,鈥 said Jake Spano, mayor in the Minneapolis suburb of St. Louis Park and a board member of the 好色tv League of Cities, which issued a report in 2021 finding that 81% of local elected officials reported receiving threats and 87% saw the problem worsening.

Officials in Spano's town got deluged in 2018, when Trump tweeted critically about its city council's decision to stop saying the Pledge of Allegiance at the start of its meetings.

鈥淭he lasting impact of Donald Trump's presidency is that he made it clear that the norms of how we treat each other no longer apply,鈥 said Spano, a Democrat.

The threats are not simply an issue of coarsening of the national discourse. Experts warn they can be precursors of political violence.

In 2017, a man who belonged to a Facebook group called 鈥淭erminate the Republican Party鈥 on GOP House members as they practiced for a charity baseball game, severely wounding now-House Majority Leader Steve Scalise. Last year, the 82-year-old husband of then-House Speaker Nancy Pelosi, a Democrat, was who had posted right-wing conspiracy theories online before breaking into the couple's San Francisco home.

Also last year, a man was outside the home of Supreme Court Justice Brett Kavanaugh amid protests against the high court overturning women's right to obtain abortions. Then an in body armor who had been at the Jan. 6 attack on the Capitol was shot and killed after trying to enter an FBI office following that last summer of Trump's Florida resort, Mar-a-Lago.

Trump has repeatedly slammed the FBI and has called for a should he win the presidency again, as he faces additional charges related to his attempts to of the 2020 election.

Trump has referred to the special counsel overseeing the federal prosecutions, Jack Smith, as 鈥渄eranged鈥 and an 鈥渙ut of touch lunatic,鈥 and to the charges against him as 鈥渆lection interference and yet another attempt to rig and steal a presidential election.鈥 He also has attacked a local Georgia prosecutor expected to file against him next week, Fulton County District Attorney Fani Willis.

Experts warn the escalating rhetoric could increase the risks of violence, especially as the 2024 election and Trump's trials draw closer. Lone attackers acting impulsively, rather than mass violence such as , are the greatest worry, said Javed Ali, a former senior FBI counterrorism official now at the University of Michigan.

鈥淭hat threat can materialize very quickly with no notice,鈥 he said.

In an affidavit from FBI agents, Craig Deleeuw Robertson sounded like he could be that type of threat.

Authorities said the self-employed woodworker referred to himself as a 鈥淢AGA Trumper鈥 鈥 referring to Trump's 鈥滿ake America Great Again" slogan 鈥 and had Manhattan District Attorney Alvin Bragg, U.S. Attorney General Merrick Garland and New York Attorney General Letitia James, all of whom have been targets of on social media.

Trump's Truth Social network was the first to warn the FBI about him after Robertson in March posted a threat to kill Bragg, the first prosecutor to against Trump.

Even after a visit from FBI agents, the affidavit said, Robertson continued posting violent words and imagery online, including quipping that if the FBI was still monitoring his posts he would 鈥渂e sure to have a loaded gun in case you drop by again.鈥 He also posted about killing Biden, who was due to visit the state Thursday.

Those who knew Robertson said he was not a danger to anyone, only an elderly, largely homebound conservative man spouting off online.

鈥淗e believed in his right to bear arms. He believed in his right to say what he feels. When it came down to it, he knew the Lord wouldn鈥檛 have approved of killing innocent people,鈥 said Paul Searing, a local businessman who followed Robertson online for years and warned him when he crossed the line on social media. 鈥淭hings got out of hand because he just was really frustrated.鈥

Michael German, a former FBI agent who is now a fellow with the Brennan Center for Justice, said social media can transform private venting into menacing-sounding threats.

鈥淭hings that may have been screamed at the television before now appear widely in public,鈥 German said.

He said the problem is that federal law enforcement to go after organized right-wing violence, such as violent acts committed by the Oath Keepers, Proud Boys and similar groups before on the Capitol.

While threats against public officials are a routine part of the country's history, German said the rhetoric by Trump and some of his supporters presents a new danger.

鈥淲hat concerns me is that authority figures 鈥 not just Trump, but many others in the Republican Party 鈥 have promoted violent groups and dismissed the violence they've committed,鈥 he said, adding that it sends a signal to some people who are sympathetic to the groups' views.

Kurt Braddock, a communications professor at American University in Washington, D.C., said rhetoric doesn't have to explicitly direct supporters to commit violence. Even if it inspires just a tiny fraction to commit crimes, it can still be dangerous given the extraordinary reach of political and across the internet and the millions of people who absorb it.

鈥淵ou get to the point where at least one person can interpret that as a call to violence,鈥 Braddock said. 鈥淎s we've seen, one person can do a lot of damage.鈥

Though the danger is greater and the rhetoric harsher on the political right, Braddock said, the left also has responsibility. More than two years before the arrest outside Kavanaugh鈥檚 house, Senate Majority Leader Chuck Schumer warned the GOP-appointed Supreme Court majority that a ruling overturning the right to abortion would mean it had 鈥渞eleased the whirlwind鈥 and 鈥渨ill pay the price.鈥

Still, experts warned against presuming that too many Americans are so radicalized that they might engage in politically motivated violence.

Joe Mernyk, a doctoral student in Stanford University's Polarization and Social Change Lab, surveyed Democrats and Republicans about their support for political violence and found it to be very low. But perceptions of those in the other party provided a different picture: People in each party believed members of the other had high support for violence.

When participants were told that, in fact, support for violence was low on the other side, their own support for violence dropped even lower, Mernyk said,

Mernyk stressed the importance of 鈥渕aking sure people know these people, like the guy in Utah, are not representative of the Republican Party or the party's attitudes.鈥

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Sam Metz in Provo, Utah and Colleen Slevin in Denver contributed to this report.

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This story was first published on August 12, 2023. It was updated on August 13, 2023, to correct that Chuck Schumer鈥檚 remarks on abortion were made more than two years before an arrest outside Supreme Court Justice Brett Kavanaugh鈥檚 house, not shortly before.

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