Sen. Rand Paul Randal (Rand) Howard PaulGOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill Overnight Health Care: Senate Democrats block GOP relief bill | Democrats reveal Medicaid chief's spending on high-paid consultants | Trump calls question about why he 'lied' about COVID-19 a 'disgrace' MORE (R-Ky.) on Wednesday called the National Security Agency's (NSA) collection of Verizon customers’ phone records an "astounding assault on the Constitution."[ Watch ]

"After revelations that the Internal Revenue Service targeted political dissidents and the Department of Justice seized reporters’ phone records, it would appear that this Administration has now sunk to a new low," he said in a statement.

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"If the President and Congress would obey the Fourth Amendment we all swore to uphold, this new shocking revelation that the government is now spying on citizens’ phone data en masse would never have happened," Paul added.

The Guardian newspaper on Wednesday published a copy of a secret court order compelling Verizon to take part in a massive data mining program to help spot suspected terrorists.

The NSA obtained information on phone numbers, the length and location of calls but no data on the content of conversations or messages. The order covered all Verizon calls since April 25, including millions of people not suspected of being involved in terrorism.

The administration on Thursday defended the NSA’s practices, saying it was “critical” to national security efforts.

An administration official said the program helped "discover whether known or suspected terrorists have been in contact with other persons who may be engaged in terrorist activities, particularly people located inside the United States."

The leaders of the Senate Intelligence Committee said they had been informed of the phone sweeping and that it had been going on since 2007.

“Everyone’s been aware of it for years, every member of the Senate,” said Sen. Saxby Chambliss Clarence (Saxby) Saxby ChamblissLobbying world GOP lobbyist tapped for White House legislative affairs The Hill's Morning Report - Gillibrand drops out as number of debaters shrinks MORE (R-Ga.), the ranking Republican on the panel.

Chambliss and Chairwoman Dianne Feinstein Dianne Emiel FeinsteinSenators offer disaster tax relief bill Democrats back away from quick reversal of Trump tax cuts Congress must save the Postal Service from collapse — our economy depends on it MORE (D-Calif.) also defended the program.

“There have been approximately 100 plots and also arrests made since 2009 by the FBI,” Feinstein said. “Terrorists will come after us if they can, and the only thing we have to deter this is good intelligence.”

Many lawmakers though said they were not aware of the full extent of the NSA’s practices and called on the administration to justify its legal rationale.

Democratic Sen. Jeff Merkley Jeffrey (Jeff) Alan MerkleyThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Sunday shows - Trump team defends coronavirus response Oregon senator says Trump's blame on 'forest management' for wildfires is 'just a big and devastating lie' MORE (D) called it an "outrageous breach of Americans' privacy."

Sen. Dean Heller Dean Arthur HellerOn The Trail: Democrats plan to hammer Trump on Social Security, Medicare Lobbying World Democrats spend big to put Senate in play MORE (R-Nev.), who along with Merkley and Sen. Mike Lee Michael (Mike) Shumway LeeMcConnell shores up GOP support for coronavirus package McConnell tries to unify GOP Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump MORE (R-Utah) backed an amendment requiring the U.S. attorney general to disclose Foreign Intelligence Surveillance Court (FISA) decisions, also criticized the NSA's actions.

"This is yet another example of government overreach that forces the question, ‘What sort of state are we living in?’ There is clearly a glaring difference between what the government is doing and what the American people think they are doing," Heller said.