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The host of NBC-TV's "Celebrity Apprentice" said the decision came after "considerable deliberation and reflection" after weeks of an unofficial campaign.
"I maintain the strong conviction that if I were to run, I would be able to win the primary and ultimately, the general election," Trump said in a statement.
(Reporting by Ros Krasny, editing by Sandra Maler)
((Ros.Krasny@thomsonreuters.com; +1 617 549 0125; Reuters Messaging: firstname.lastname@example.org))