The Senate Judiciary Committee unveiled long-awaited legislation Tuesday to reform the Freedom of Information Act (FOIA) that would make it more difficult for government agencies to withhold documents from the public.

One of the most significant changes to the law, on which lawmakers and transparency advocates have spent months working together, revolves around a FOIA exemption that transparency advocates say has been widely misused, and cited thousands of times to explain why certain records must be concealed from the public.

Exemption 5 applies to government records that are part of a behind-the-scenes decision-making process — called “deliberative” — and covers any “inter-agency or intra-agency memorandums or letters,” drafts and attorney-client records. It’s a discretionary exemption that government agencies could waive in favor of disclosure. But transparency advocates say the government rarely does.

Nate Jones, the FOIA coordinator for George Washington University’s National Security Archive, said “everyday requesters” would greatly benefit if the bill, dubbed the FOIA Improvement Act, is passed and signed into law.

“The most important part of this bill is its fix to the Exemption 5 'withhold it because you want to' exemption,” Jones said. “Agencies will no longer be able to hide misdeeds by withholding requested documents merely by claiming they were inter- or intra-agency communications."

In 2012, according to Senate Judiciary Committee Chairman Patrick Leahy, D-Vt., one of the sponsors of the FOIA reform bill, government agencies cited the exemption more than 79,000 times, a 41 percent increase compared with the previous year. Last year, according to statistics compiled by The Associated Press, the use of Exemption 5 reached an all-time high: 81,752, accounting for 12 percent of all the open-records requests government agencies processed in 2013 that resulted in denials.

"The Freedom of Information Act is one of our nation's most important laws, established to give Americans greater access to their government and to hold government accountable," Leahy said Tuesday. In March, the senator chaired a Judiciary Committee hearing where he outlined his concerns about the growing use of exemptions.

Leahy said the FOIA reforms he and Cornyn authored have attracted "broad, bipartisan support."

Earlier this year, Leahy told the Associated Press that he was becoming concerned about the “growing trend toward relying upon FOIA exemptions to withhold large swaths of government information.”

"It becomes too much of a temptation,” Leahy added. “If you screw up in government, just mark it 'top secret.'"