The waiver would allow Mattis to bypass law on armed services personnel.
Committee threatened by Republicans to point out illicit campaign expenses in upcoming report.
House Democratic leader Nancy Pelosi ridicules 'drain the swamp' claims following the move.
Democrats staged a sit-in in June after Republican refused vote on gun-control bills.
The disclosures are expected to be made public as early as January 2017.
Sir Michael Fallon and Ash Carter again called for a political settlement to stop civil war.
US lawmakers insisted that the renewal was important to keep a check on Iran's behaviour.
Republican senator John McCain urges President-elect Trump to accept CIA's report on hacking.
The short-term spending bill must be approved by Friday (9 December) to avoid a government shutdown.
The revised agreement will be directly presented before the Congress for approval.
New York Senator Chuck Schumer will now serve as minority leader.
Senate Democrats have also called on the president-elect to change course and sack Bannon.
The president-elect faces a number of lawsuits, including a fraud case involving the defunct Trump University.
Construction, security and pharmaceutical companies could benefit from Trump's policies.
The newly elected US president will not face the hurdles Barack Obama dealt with.
The GOP nominee proposed capping Senate members to two terms and House members to three terms.
Republican stalwarts didn't pull any punches as they told people to vote for someone else.
The bill allows 9/11 victims and families to sue Saudi Arabia for its alleged involvement in attacks.
The bill excludes funding for residents of Flint, Michigan but did include funds to fight Zika.
Comey called on state officials to remain vigilant as 'bad players have been poking around.'
The first override of Obama's presidency may allow victims' families to sue Saudi Arabia.
If the legislation is passed it would empower hostile nations to take legal action against the US and its allies.