Nancy Pelosi: Donald Trump Cannot Be 'Casually Loose-Lipped'

House Minority Leader Nancy Pelosi (D-Calif.) said Monday it’s a “very serious matter” that President Donald Trump may have revealed classified information during a meeting with Russian officials.

The Washington Post reported Monday that Trump revealed “code-word information” during a meeting Friday with the Russian foreign minister and ambassador at the White House. Pelosi initially responded to the report by saying Trump had “jeopardized the security of the American people.”

During a CNN town hall Monday evening, Pelosi said Trump should not be “casually loose-lipped” while discussing sensitive information.

“Loose lips can sink ships,” she said.

Pelosi argued that revealing any information to an adversary ― even things that are “already publicly known,” as National Security Adviser H.R. McMaster described what Trump told the Russians ― could “undermine an operation that could be saving lives.”

“If it was on purpose, that would be terrible. If it was accidental, that would be very terrible, too,” Pelosi argued.

This story has been updated to include more comments from Pelosi.