Washington (CNN) It's Rand Paul against everyone else in the Republican presidential field on the government's controversial phone records dragnet.

The Kentucky senator and presidential candidate's role in blocking a measure that extends some of the Patriot Act's provisions, citing civil liberties concerns, has set up a showdown in a rare Sunday evening Senate session — and turned Paul into a punching bag for other GOP candidates and potential Republican hopefuls who are seeking to show strength on foreign policy.

Former Florida Gov. Jeb Bush said on CBS's "Face the Nation" that ending the program Paul has targeted would put the nation's security in danger.

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"There's not evidence, not a shred of evidence, that the meta-data program has violated anybody's civil liberties," said Bush, who plans to make an announcement soon about whether he will run.

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