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Law enforcement is more worried about other parts which they say leave them partially blind. >> so i'm left looking for needles in a haystack where the needles are increasingly invisible to me. >> expired, roving wire taps which allow law enforcement to follow a terrorist and not just on one phone. if a suspect changes phones multiple times, the tracking continues. lone wolf tracking. investigators could track a suspect without a subpoena and now will have to go to court for each case. >> if i lose those tools, it is a huge problem. >> those tools are gone because of a political battle here on...

Has this story. >> reporter: on capitol hill, time is almost up and the scramble in the senate is about to be on. >> we shouldn't surrender the tools that help keep us safe. >> reporter: unless the senate acts at midnight tonight key provisions of the patriot act will expire. >> the bulk phone program operates under this. it collects numbers dialed and how long calls lasted but does not capture the contends of conversation and other surveillance provisions set to expire, one allowing the government to seek a court order, roving wire taps for burned phones and the ability too track an american ...

Information, but those ways are more limited and less secret. roving wire taps on people who switch cell phones. that is used less than 100 teams a year. officials do say the patriot act is the only way to do that. to effectively and quickly track those people. especially when you consider potential isis types. and lastly, wire taps on lone wolves. people not connected to any known terror group. we found out that has never even been used before and it only applies to people outside the u.s. not american lone wolves. the big question is our national security really going to be at risk? depends ...

People who wished harm on the united states. >> reporter: that's what they're saying. the thing is u.s. officials can't point to any one case where these programs saved the day and thwarted terror. if you look at the other programs besides the bulk data collection that are going to expire being able to collect an individual's data bank data hotel data things like that that's used about 200 times a year. officials say, yeah there are other ways to go about getting that kind of info but those would be more limited and less secret. also roving wire taps on people who keep switching cell phones. t...

The undercovered stories of the week. first congress votes to extend key parts of the patriot act. it was a law designed to help track down terror suspects. the provisions deal with roving wire taps, access to records and tracking so-called lone wolf terrorists. in a senate debate, there were some testy moments this week between republican rand paul and majority leader harry reid. >> unless the senator from kentucky stops standing in the way, our law enforcement will no longer be able to use some of the most critical tools they need to counter terrorists and combat terrorism. if they cannot us...