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By Julia Harte WASHINGTON (Reuters) - Republican U.S. Senator Ted Cruz on Tuesday accused the Obama administration of under-emphasizing the "threat of radical Islam" as he presided over a Senate hearing for the second time since suspending his presidential campaign in early May. President Barack Obama and top Justice Department officials have come under fire from conservatives for avoiding the term "radical Islam" when denouncing attacks by violent extremists who claim inspiration from Islamic State, such as the Orlando nightclub shooter. Administration officials have countered that focusing on the use of the phrase is a political distraction and gives fuel to Islamic State propagandists who say the United States has waged war against all of Islam.