<p>The biggest national security threat to the United States is coming from inside the White House, Rush Limbaugh said on his radio show Tuesday.</p><p>Discussing President Barack Obama's "60 Minutes" interview that aired Sunday, Limbaugh blasted Obama's comment that Hillary Clinton's use of a private email server <a href="http://www.politico.com/story/2015/10/obama-clinton-emails-security-60-minutes-214656">did not constitute</a> a national security threat.</p><p>Obama told CBS' Steve Kroft that Clinton "made a mistake" and "has acknowledged it."</p><p>That, Limbaugh remarked, "is rich coming from Obama, because Obama is America's number one national security problem, if you ask me." Limbaugh went on to say that he is "not exaggerating" or "going for laughs here."</p><p>"I really mean it," he told listeners.</p><p>Limbaugh explained his risk assessment of the commander in chief by criticizing the contents of the nuclear agreement with Iran as well as the administration's weakened hand vis-à-vis Russian President Vladimir Putin and his country's involvement in the Middle East.</p><p>"I think Barack Obama's our number one national security problem or risk, whether by accident, by design," he said.