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With youth sports leagues facing scrutiny over head injuries among young players, the new findings will undoubtedly fuel debate.
Huckabee was the first conservative to indicate a run for the White House in 2016.
The walkout came at a time when crude-oil prices have been falling for months, which can be a bane for producers but a boon for refiners.
The one-time "tax would mean that companies have to pay U.S. tax right now on the $2 trillion they already have overseas," an official says.
The call for "an immediate ceasefire" comes one day after the latest round of truce talks buckled in Minsk Saturday.
Greece has enough money on hand to meet its February and March obligations of 3.5 billion euros ($3.95 billion) but not anything beyond that.