Over the past decade, attackers motivated by right-wing political ideologies have committed dozens of shootings, bombings and other acts of violence, far more than any other category of domestic extremist, according to a Washington Post analysis of data on global terrorism. While the data show a decades-long drop-off in violence by left-wing groups, violence by white supremacists and other far-right attackers has been on the rise since Barack Obama's presidency -- and has surged since President Trump took office.

This year has been especially deadly.Just last month, 13 people died in two incidents: A Kentucky gunman attempted to enter a historically black church, police say, then shot and killed two black patrons in a nearby grocery store. And an anti-Semitic loner who had expressed anger about a caravan of Central American refugees that Trump termed an "invasion" has been charged with gunning down 11 people in a Pittsburgh synagogue, the deadliest act of anti-Semitic violence in U.S. history.

This month brought two more bodies: A military veteran who had railed online against women and blacks opened fire in a Tallahassee yoga studio, killing two women and wounding five. All told, researchers say at least 20 people have died this year in suspected right-wing attacks.

While Trump has blasted Democrats as "an angry left-wing mob" and the "party of crime," researchers have identified just one fatal attack in 2018 that may have been motivated by left-wing ideologies.