WASHINGTON (AP) – President Donald Trump urged the new leader of Ukraine this summer to investigate the son of former Vice President Joe Biden. That’s according to a person familiar with the matter. Democrats condemned what they saw as a clear effort to damage a political rival, now at the heart of an explosive whistleblower complaint against Trump. It was the latest revelation in an escalating controversy that has created a showdown between congressional Democrats and the Trump administration, which has refused to turn over the formal complaint by a national security official or even describe its contents.