What's happening on the campaign trail today Pressure is building on President Joe Biden to drop out of the 2024 race, as <span style="background-color:#ffffff">more Democrats</span>, both <span style="background-color:#ffffff">privately and publicly</span>, say it's time for him to step aside. Sen. Sherrod Brown, of Ohio, today became the fourth Senate Democrat to call for Biden to abandon his re-election bid, following Sen. Jon Tester, of Montana; Sen. Peter Welch, of Vermont; and Sen. Martin Heinrich, of New Mexico. Today alone, 13 congressional Democrats said publicly for the first time that Biden should exit the race. Biden and the first lady are home in Delaware after the president tested positive for Covid on Wednesday. Donald Trump today spoke with Ukrainian President Volodymyr Zelenskyy, who congratulated Trump on formally accepting the GOP nomination for president. They also discussed the Russia-Ukraine war, which Trump has vowed to have "settled" if he wins in November. Trump's July 2019 phone call with Zelenskyy, during which he tried to pressure the Ukrainian leader into opening an investigation into then-candidate Joe Biden, led to his first impeachment.