WASHINGTON — Republican Sen. Lindsey Graham announced Monday he was ending his 2016 presidential campaign.

The South Carolina senator posted a video saying he had run "a campaign we can be proud of" focused on the nation's security.

Graham, 60, is an Air Force veteran and reservist and a foreign policy hawk who said he was running for president because the job called for someone with experience. He delivered several wry one-liners during a presidential debate early this fall. But he was left out of the most recent debate because his poll numbers had dropped below the threshold.

Graham announced his candidacy in June. He was urged to run by Senate Armed Services Committee Chairman John McCain, who was the GOP presidential nominee in 2008.