Republican Lindsey Graham says quitting race for White House

>

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

Graham, a hawk on defense and foreign policy, ranked in lowest tiers in opinion surveys of Republican voters in a race being dominated by a political outsider, real estate tycoon Donald Trump.

"I'm going to suspend my campaign. I'm not going to suspend my desire to help the country," Graham said. "I've hit a wall here."

Graham said he was proud of what he called his bold, practical solutions on debt and immigration.

"I got into this race to put forward a plan to win a war that we cannot afford to lose, and to turn back the tide of isolationism that was rising in our party. I believe we've made enormous progress in this effort," he said.

(Reporting by Mohammad Zargham, Susan Heavey and Doina Chiacu)