A staunch social conservative, Santorum finished second to
eventual Republican nominee Mitt Romney in 2012.
Santorum's website said "a special announcement" would be made
in Pittsburgh on the evening of May 27.
If he enters the race, Santorum would join a field that so far
includes Senators Rand Paul of Kentucky, Ted Cruz of Texas and
Marco Rubio of Florida; former Arkansas Governor Mike Huckabee;
former Hewlett-Packard Co chief Carly Fiorina; and retired
neurosurgeon Ben Carson.
(Reporting by Eric Beech; Editing by Peter Cooney)
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