President Trump participates in a roundtable on defense spending at Luke Air Force Base. Trump also gives his first remarks on the news out of Saudi Arabia of Jamal Khashoggi's death at the Istanbul consolate.
Update: Officer Samuel Jimenez has died after being shot at Mercy Hospital. Developing: Police responded to an active shooter situation at Mercy Hospital in Chicago's South Side neighborhood on Monday evening. Among the confirmed injuries is a police officer currently in critical condition.
Trump at the U.S.-Mexico border: The president travels to the Rio Grande Valley to be briefed on border security. Trump is expected to make his case for a $5.7B steel wall along the southern border.
Trump promised a mystery 'major announcement' regarding the partial government shutdown and border security, without releasing further details.
A migrant caravan gathered in Mexico prompts U.S. Customs and Border Patrol to brief the media on law enforcement preparedness in Eagle Pass, Texas.