President Donald Trump suggested Sunday that he mentioned former vice president Joe Biden and his son Hunter in a phone call with the leader of Ukraine, as Democrats ramp up their calls for accountability amid swirling questions about whether Trump sought to use his influence to seek re-election help from a foreign country. In an exchange with reporters outside the White House before departing for events in Texas and Ohio, Trump was asked about his July 25 conversation with Ukrainian President Volodymyr Zelensky.