U.S. President commends Kenya for commitment to anti-graft effort

"This may be the biggest impediment to Kenya growing faster," Obama told a joint news conference with his Kenyan counterpart, while praising Kenyatta for making the issue a top priority of his administration.

Obama also said the presidential vote held last week in the central African state of Burundi in the face of criticism by many African and Western states was not "credible."

(Writing by Edith Honan; Editing by Catherine Evans)