In this March 21, 2011, file photo, from left, former President Bill Clinton, former President George H.W. Bush and his wife Barbara Bush stand for the National Anthem at the Kennedy Center. Clinton has been spending some time with former President George H. W. Bush and wife Barbara in Houston. In the tweet on Sunday, April 9, 2017, Clinton said they "caught up about kids, grandkids, old times and new times. And socks." (AP Photo/Carolyn Kaster, File)
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