US President Donald Trump telephoned Hungarian Prime Minister Viktor Orban on Monday after hosting Ukrainian President Volodymyr Zelensky and several European leaders in Washington, according to a White House official. Trump asked Orban to explain why Hungary continues to block the start of European Union accession negotiations with Kyiv, an issue that has frustrated other EU members. The call followed appeals from European leaders who had urged Trump to use his influence over the right-wing Hungarian leader. Hungary remains the lone hold-out preventing the EU from opening formal membership talks with Ukraine. People familiar with the conversation said Orban did not pledge to lift his veto, and in a subsequent social-media post he reiterated that Ukraine’s EU membership would not bolster Europe’s security. The two leaders also discussed the possibility of hosting a face-to-face meeting between Zelensky and Russian President Vladimir Putin in Budapest, the White House official said. While no date was set and Moscow has not confirmed interest, Budapest is being floated as a potential neutral venue for future peace talks.