President Donald Trump welcomed Ukrainian President Volodymyr Zelenskyy to the White House for a high-stakes meeting as the U.S. president pushed for a deal to end Moscow's war on its neighbor. A host of European leaders joined the pair.

New hurdles are emerging for a possible meeting between Russian President Putin and Ukrainian President Zelenskyy. Rep. Josh Gottheimer (D-NJ), a member of the House Intelligence Committee, joins Ali Vitali to share more on what he knows about the potential summit and to discuss the expanded National Guard presence in Washington,

Wesley Clark, U.S. Army General (Ret.) and former NATO supreme allied commander, joins 'Squawk Box' to discuss the push to resolve the Russia-Ukraine war, what's next after President Trump's meeting with Russian President Vladimir Putin and Ukrainian President Zelenskyy,

As Zelenskyy didn't wear a formal suit during the Feb. 18 meeting, users on Polymarket, a crypto-based prediction platform, placed bets on whether he would wear a suit before July. As Zelenskyy met Trump in the Oval Office on Aug. 18, Polymarket users are betting on what the U.S. president would say during the event.

Putin meeting in Anchorage, Alaska, as U.S. works with European allies on Ukraine security guarantees for potential peace deal.