There's safety concerns for U.S. citizens in Syria and American activists in Egypt.  Plus, the White House is putting more pressure on Iran over its nuclear ambitions.

FOX News Radio's Mike Majchrowitz has this report from the White House as part of our on going series on national security:

Securing America:

In Syria, the U.S. Embassy stands empty. The Ambassador and its American staff have left the country.

Nuland: "We have security concerns about the safety of our personnel."

State Department Spokesperson Victoria Nuland. Meanwhile, the White House is warning Egypt not to prosecute 19 American activists.

Carney: "These actions could have consequences for our relationship, and including our assistance programs."

And White House Spokesman Jay Carney announced the administration is ramping up sanctions on Iran over its nuclear program.

Carney: "And they continue to pursue a course that is dangerous. We will ramp up the effort to isolate and pressure the regime."

But so far, efforts to clamp down on Iran and Syria at the United Nations have been foiled by Russia and China.

At the White House, Mike Majchrowitz, FOX News Radio.

Watch HERE for more on the U.S. Embassy closure in Syria:

           Email            Embed

Watch HERE for more on the 19 Americans set to go on trial in Egypt:

           Email            Embed

Watch HERE for more on Military exercises in Iran:

           Email            Embed