(NewsNation) — How did officials manage to get President Joe Biden safely into Kyiv, Ukraine, an active warzone, in complete secrecy? Experts discuss logistics and protocols as Biden now heads to Warsaw, Poland.

Col. Daniel Davis, senior fellow and military expert at Defense Priorities and Chuck Marino, a former Department of Homeland Security and Secret Service agent, joined NewsNation’s “Rush Hour” to share insights into the months of work required to make Biden’s trip possible.

“It really became a need-to-know operation,” Marino said.

Watch the full discussion in the video above.