WASHINGTON — About 90 minutes after President Trump held a controversial telephone call with President Volodymyr Zelensky of Ukraine in July, the White House budget office ordered the Pentagon to suspend all military aid that Congress had allocated to Ukraine, according to emails released by the Pentagon late Friday. A budget official, Michael Duffey, also told the Pentagon to keep quiet about the aid freeze because of the “sensitive nature of the request,” according to a message dated July 25. An earlier email that Mr. Duffey sent to the Pentagon comptroller suggested that Mr. Trump began asking aides about $250...