Whistleblower accuses White House of Ukraine call cover-up

Activists rally for the impeachment of President Donald Trump on Thursday at the Capitol in Washington. (AP Photo/J. Scott Applewhite)

WASHINGTON — White House officials took extraordinary steps to “lock down” information about President Donald Trump’s summertime phone call with the president of Ukraine, even moving the transcript to a secret computer system, a whistleblower alleges in a politically explosive complaint that accuses the administration of a wide-ranging cover-up.