Public health officials investigating a drug-resistant salmonella outbreak in 2015 still don’t know the exact source after a pork-industry lobbying group on behalf of the farmers prevented them from visiting farms that provided pigs to a contaminated slaughterhouse Source

On Sunday, a top defender of President Trump detailed a new way to move forward with the impeachment proceedings. Congress returns to work on Monday still locked in a stand-off over how to proceed with the impeachment trial. Nikole Killion reports. Source

The body of the leader of Iran’s Quds Force, General Qassem Soleimani, was returned following his assassination by an American airstrike in Baghdad, an act one Middle East expert calls a declaration of war by the Trump administration against Iran. Holly Williams reports from Northern Iraq. Source

Australian Prime Minister Scott Morrison has again been forced to defend his response to the country’s devastating wildfires. Tom Hanson reports as some people feel the political response has fallen short. Source

Lawmakers are reacting to a confidential document the White House provided to Congress as part of its formal notification of military action in Iraq, a requirement under the War Powers Act. Meanwhile in the race for 2020, Democratic presidential candidates have announced their fourth quarter fundraising totals. Julia Manchester, political reporter for The Hill, joins CBSN to break it all down in this edition of the Politics Week in Review. Source

Here’s a look at the top stories making headlines on the “CBS Weekend News” anchored by Elaine Quijano. Source

The secretary of state said the administration made the “right decision” to eliminate an apparent threat posed by Iranian military leader Qassem Soleimani. Source

CBS News’ Holly Williams and David Martin break down the latest developments overseas amid escalating tensions with Iran. Source

The DNC chair says he disagrees with the contention that the party’s debate qualifications made it hard for minority candidates to make it to the debate stage. Source

The Republican senator from Florida says President Trump was “obligated” to act against an “imminent threat” against the U.S. Source