 One day after accepting his party's nomination for president. Former President Trump had a call with Ukrainian President Zelensky. It was Zelensky who initiated the call. It lasted about 15 or 20 minutes. And a source close to the Ukrainian president described the call as, quote, warm and respectful. ABC News Chief Washington correspondent Jonathan Karl on the campaign trail this year. The former president has vowed to end the war in Ukraine on day one in office, but hasn't detailed how he would do that.