Three Democratic senators filed a brief in federal court on Tuesday supporting a lawsuit to end the National Security Agency's bulk collection of phone records.

Sens. Mark Udall Mark Emery UdallThe 10 Senate seats most likely to flip Democratic presidential race comes into sharp focus Democrats will win back the Senate majority in 2020, all thanks to President Trump MORE (Colo.), Ron Wyden Ronald (Ron) Lee WydenGOP senator blocks Schumer resolution aimed at Biden probe as tensions run high Republican Senators raise concerns over Oracle-TikTok deal Hillicon Valley: TikTok, Oracle seek Trump's approval as clock winds down | Hackers arrested for allegedly defacing U.S. websites after death of Iranian general | 400K people register to vote on Snapchat MORE (Ore.) and Martin Heinrich Martin Trevor HeinrichSenate Democrats demand White House fire controversial head of public lands agency Senate Democrats seek removal of controversial public lands head after nomination withdrawal Five takeaways from final Senate Intel Russia report MORE (N.M.), who all have access to classified information as members of the Senate Intelligence Committee, argued that the controversial program does little to combat terrorism.

"[The senators] have reviewed this surveillance extensively and have seen no evidence that the bulk collection of Americans’ phone records has provided any intelligence of value that could not have been gathered through less intrusive means," lawyers for the lawmakers wrote.

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They argued that more targeted surveillance programs could have been used to gather the same information that the NSA obtained through the phone data collection.

"Because the government’s call-records program needlessly intrudes upon the privacy rights of hundreds of millions of Americans, [the senators] believe the bulk collection of these phone records should be ended," they wrote.

The controversial program collects phone numbers, call times and call durations on virtually all U.S. phone calls, but not the contents of communications.

The lawmakers filed their brief to support a lawsuit from a coalition of civil liberties groups led by the Electronic Frontier Foundation.

The lawsuit claims that the bulk collection violates constitutional rights to privacy, free speech and free association. Public Knowledge, TechFreedom, a Unitarian church and a California gun rights group also signed on to the suit, which was filed in California.

The senators are also pushing legislation to end the bulk phone data collection.

Defenders of the program argue it is critical for "connecting the dots" and thwarting terrorist attacks.