But questions are also being asked about whether Craig Robertson was a "credible threat", as the FBI claims, or, as neighbours in Provo, Utah, have described to local media, a man harbouring anti-government views who walked with a stick and liked to bluster and tell big stories, especially on social media.
Robertson had posted threats against the president, including asking whether Utah would become famous "as the place a sniper took out Biden the Marxist". He'd also urged Utah residents to fire their guns into the air when Air Force One arrived, the Deseret News reported.
Late last month Robertson posted a message: "Hey FBI, you still monitoring my social media? Checking so I can be sure to have a loaded gun handy in case you drop by again."
On Sunday, three days before Biden's visit, Robertson posted: "I hear Biden is coming to Utah. Digging out my old ghillie suit and cleaning the dust off the M24 sniper rifle."
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