Sen. Lindsey Graham dropped out of the race for the White House on Monday, leaving 13 Republicans vying for the party's 2016 presidential nomination.



"Today, I'm suspending my campaign for president," the South Carolina senator said in a video posted on YouTube.

Watch the Graham video here.

Fellow Republican candidate Jeb Bush tweeted his reaction to Graham's announcement. He said he hopes the Republican party and the country will continue to heed Graham's advice.

Jeb Bush Tweet

In his announcement, Graham said he is "far more confident today that [the Republican party] will reject the Obama doctrine of leading from behind and will provide the strong leadership America needs to restore our military."

He said he would continue to work to ensure that the nation takes an active role in fighting its enemies.

"I'm suspending my campaign, but never my commitment to achieving security through strength for the American people," Graham said.