(CNN) - Likely GOP presidential nominee Mitt Romney called former President George W. Bush to thank him for his support, two sources told CNN.
On Tuesday, Bush made headlines when he gave an off-the-cuff endorsement for the former Massachusetts governor, telling an ABC News reporter "I'm for Mitt Romney," as the doors of an elevator he was on closed before him.
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Bush was in Washington, D.C. at the time to make a rare public appearance at a ceremony for dissidents.
The remark was the first public support from the former president, whose father, former President George H.W. Bush and mother, Barbara, endorsed the presumptive GOP nominee in March.
Romney's campaign responded later in the day, saying they "welcomed" the nod.
"We welcome the president's support, as we welcomed his father's," spokeswoman Andrea Saul said.
Romney, however, rarely refers to the 43rd president by name in speeches, often using the word "predecessor" instead.
Bush's younger brother, former Florida Gov. Jeb Bush, also endorsed Romney in March.