Actor James Woods also tweeted that he will be praying for the president.

Following the flood of well-wishes, Carter's grandson and former Georgia state Sen. Jason Carter also took to Twitter to extend the Carter family's appreciation for the support.

Carter revealed in a statement today that a recent liver surgery led to the discovery of cancer that has spread to other parts of his body.

\"Recent liver surgery revealed that I have cancer that now is in other parts of my body,\" the former president, 90, said in a statement today. \"I will be rearranging my schedule as necessary so I can undergo treatment by physicians at Emory Healthcare.\"

Carter said that additional details of his disease, once they are known, will be made public as soon as next week.

Carter served as president from 1977 to 1981. After his time in the White House, Carter returned to his native Georgia and founded The Carter Center. The center, based at Emory University, promotes public health issues, global conflict resolution, and democracy.

He has also written dozens of books, ranging from topics of Middle East peace to autobiographical accounts of his life and time as president. His most recent book, \"A Full Life,\" was released following Carter's 90th birthday and is a reflective account of the president's life.

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