The list includes the outgoing NYPD commissioner, one of the country's leading female police chiefs and two people who spoke at the Democratic National Convention.
Trump said Clinton-backed policies were responsible for "inner city problems."
Biden has become a liaison between the White House and police.
Micah Johnson's home revealed that he had practiced using explosives and wanted to use them against police, Chief David Brown said.
"Whenever those of us who are concerned about failures of the criminal justice system attack police, you are doing a disservice to the cause," president says in Spain.
'Without our actions, he would have, he would have hurt more officers,' police chief David Brown says.
Police say Alva Braziel ignored orders to drop a firearm, forcing them to shoot.
Micah Johnson's home contained bomb-making materials, rifles, ammunition and ballistic vests.
Micah Johnson was killed after a robot delivered and detonated a bomb.
The shooter was a U.S. Army reservist who served in Afghanistan.
Five officers were killed by sniper fire during a peaceful protest in downtown Dallas.
President Obama reacted on Friday to the murder of five policemen.