Republican candidates are returning to the debate stage for a fourth time Wednesday night. CBS News chief political analyst John Dickerson shares questions he would ask the presidential hopefuls. Source

The chair of the National Transportation Safety Board on Wednesday warned there is a “culture of silence” around mental health that’s affecting safety in aviation. CBS News senior transportation correspondent Kris Van Cleave has more on the calls for change within the industry. Source

Special Climate Envoy John Kerry wrapped up the first week of the COP28 climate summit in Dubai by announcing the U.S. supports “largely” phasing out fossil fuels. CBS News national correspondent Dave Malkoff joins to discuss. Source

Former House Speaker Kevin McCarthy is resigning from Congress at the end of December. CBS News congressional correspondent Nikole Killion explains what drove McCarthy’s decision. Source

Brigadier General Warren Wells wrote in a 2013 email to staff: “the sexual assault ridiculousness continues.” Source

CVS announced a new policy to make prescription drug prices more predictable. Tina Reed, senior health care reporter at Axios, joins CBS News to discuss what the move means for consumers. Source

Senate Republicans blocked an emergency aid package to fund Ukraine’s defenses against the Russian invasion Wednesday. CBS News chief White House correspondent Nancy Cordes has the latest. Source

Here’s a look at the top stories making headlines on the “CBS Evening News with Norah O’Donnell.” Source

At least three people were killed in a shooting Wednesday at the University of Nevada, Las Vegas, police said. The suspect is also dead. KLAS-TV reporter Vanessa Murphy has more. Then, Kirk Burkhalter, director of the 21st Century Policing Project, joins to discuss what happens next. Source

The U.S. Air Force is grounding its entire fleet of Osprey aircraft after learning that a crash last week may have been caused by an equipment malfunction. Source