Rep. Peter Roskam, R-Ill., charged Monday that it's the Democrats, not Republicans, who have used the investigation into the 2012 Benghazi attack as a political weapon.

"It's not Republicans who are politicizing this, it's Democrats," Roskam told the Washington Examiner at the Republican National Convention in Cleveland.

Roskam, who is a member of the House Select Committee on Benghazi, said Democrats on the panel "were trying to make sure there was no investigation."

"They made false claims all during the investigation," Roskam added, noting eight new eyewitnesses had been "forthcoming" with the committee even after Democrats tried to argue that all questions about the 2012 attack had been asked and answered.

The committee's final, 800-page report faulted the administration for mishandling the military response to the Benghazi raid and then misleading the public about what caused it.

"The public knows what actually happened in Benghazi," Roskam said. He argued people need to decide for themselves who they should hold responsible for the attack that claimed the lives of four Americans now that the evidence of the select committee's two-year probe has been made public.

The Benghazi attack emerged as a prominent theme on the first night of the Republican convention, as three of the primetime speaking slots went to survivors of the attack and the mother of Sean Smith, one of the four victims.