The outgoing Democratic Party chief is addressing cybersecurity concerns after internal communications were stolen by hackers and leaked during the 2016 presidential election.
U.S. intelligence officials blame Russian agents.
Donna Brazile tells Democratic National Committee members gathered in Atlanta that the party has worked with high-tech experts to leave the party more secure.
She chides President Donald Trump for his mockery of DNC cybersecurity and his doubts that Russians are at fault.
Brazile is urging Congress to investigate whether Russians hacked the Republican National Committee.
No RNC emails were leaked during the 2016 campaign. Republican officials insist their party communications were not breached.
Brazile suggests that proves Russians wanted to help Trump.