Hamas returns four hostages killed in captivity, including Bibas brothers; Zelenskyy meets with Trump envoy in Ukraine as questions swirl about US support; Mexico ramps up troop levels at US-Mexico border; and more on tonight's broadcast.

Police officer killed, at least 5 others injured in Pennsylvania hospital shooting; Vatican says Pope Francis in ‘critical' condition; Trump touts efforts to reshape government in CPAC speech; and more on tonight's broadcast.