Donald Trump is pushing the US towards an unprecedented political crisis following the murder of Charlie Kirk, Barack Obama has suggested.
The former US president criticized the administration's rhetoric about the assassination while speaking in Pennsylvania on Tuesday.
"When I hear not only our current president, but also his aides, who have a history of calling political opponents 'parasites,' enemies who should be 'targeted,' that speaks to a broader problem that we have now and something that we will have to confront," Obama said.
Hours after Kirk's death was announced, Trump said in a televised statement that the "radical left" was "directly responsible for the terrorism we are seeing in the country today."
The 31-year-old father of two was shot in the throat with a single bullet while leading a debate session at Utah Valley University last week.
Obama suggested that the US president had used the killing of the influential activist to push a political narrative, saying his failure to unite Americans across the public spectrum constituted a "political crisis of the kind we have never seen before."
"What I'm describing is not a Democratic value or a Republican value. It's an American value," Obama said. "And I think in moments like this, when tensions are high, then part of the president's job is to bring people together."
He compared Trump to George W. Bush, the former Republican president, and the two Republicans he defeated in the presidential election, John McCain and Mitt Romney, who he said believed in uniting the country.
Obama also referred to Dylann Roof, the white supremacist who killed nine black people at a church in Charleston, North Carolina in 2015.
"As president of the United States, my response was not, who could have influenced this troubled young man to engage in that kind of violence? And now let me go after my political opponents and use him," he said.
Trump has said he wants the US to unite after the killing, but blamed a "group of radical left-wing lunatics" for hindering national unity.
Since the killing, the White House also announced a crackdown on left-wing "terrorist" groups.
Stephen Miller, the president's deputy chief of staff, said Monday that eliminating the apparent threat [from the left] was Kirk's last wish, vowing to "do what's necessary."
"The last message Charlie Kirk gave me before he joined his creator in heaven was that he said we need to disband and confront the radical left-wing organizations in this country that are inciting violence. That was the last message he sent me... we are going to do this," he told Fox News.