51 days: Kamala Harris has yet to do formal press conference since emerging as Democratic nominee

Vice President Kamala Harris has gone 51 days as the presumptive, and now, official Democratic nominee for president without holding an official press conference. 

Now, she faces the biggest test of her candidacy so far: a debate with former President Trump.

Under pressure to sit down for a substantive interview after weeks of stonewalling, Harris finally ended her interview drought last month when she was joined by running mate Tim Walz for a pre-taped piece with CNN's Dana Bash last...