Iran and weapons of mass destruction
"Nothing is off the table," President Donald Trump said.
The White House said on Wednesday that Iran had been "formally put on notice."
The White House is stiffening its posture towards Tehran.
Flynn, who recently consolidated national security power, sees Iran as the U.S.'s number one enemy.
WHAT'S HAPPENING
The President-Elect also criticized Moscow for its role in Syria.
"We urge you to preserve this critical U.S. strategic asset," the group said in an open letter.