FILE - President Joe Biden, joined by President of Ukraine Volodymyr Zelenskyy, speaks on the sidelines of the NATO Summit in Washington, July 11, 2024. Biden introduced Zelenskyy as "President Putin," prompting audible gasps from the audience. Biden is on a public and private blitz to shake off concerns about his cognitive capacities. But with public doubts about his fitness to serve unabating, Biden's every move is now under a withering microscope as any potential stumble risks becoming magnified and delivering another blow to his candidacy. (AP Photo/Susan Walsh, File)
FILE - President Donald Trump, left, welcomes Hungarian Prime Minister Viktor Orban to the White House in Washington, on May 13, 2019. European allies in NATO are stepping up their military spending, just as Trump wanted. Although not as openly as Orban, who visited Trump's Mar a Lago after the 2024 NATO summit, European officials work to build relationships with the Trump camp, former diplomats say, adding that building wide circles of contacts is just part of being a good diplomat. (AP Photo/Manuel Balce Ceneta, File)
FILE - Leaders take their seats for a meeting of the NATO-Ukraine Council during the NATO summit in Washington, July 11, 2024. European allies in NATO are stepping up their military spending, just as Donald Trump wanted. In words, deeds and arms deals, leaders of the United States' partner countries in NATO are making the case for the military alliance in ways likely to appeal to the presumed Republican presidential nominee. (AP Photo/Jacquelyn Martin, File)