This is CNN Breaking News.

We've just learned the United States embassy in Cairo which is huge has now order mandatoryevacuation of many of the people who work there including family members.

Let's bring in our foreign affairs correspondent , Joe for the very latest.

I know there's deep concern when I was in Cairo in January,

I saw this huge concrete blocksurrounding the US embassy.

There were such fear of people storming the embassy and I know that there's plenty of anger at the United States for supposedly backing Morsi weight now.

What's the very latest,Jill, that you're getting?

"It is, Wolf that this now is coming from a senior administration official that the embassy is now saying that non-essential personnel have to leave.

It's mandatory evacuation.

Some would remain if people there who are very important will remain to that operation but just a few days ago, they had voluntary, inother words, families could leave.

Now, they really have to leave.

How they get out?

Originally, they were saying that if there are commercial flights they could do that and of course that depends on the security situation.

So, we try to establish how exactly those personnel would get out.

And don't forget, Wolf that.

just a few days ago, was reporting that US marines who are stationed in Southern Europe are on alert as a precaution .

They go in very quickly if thesituation turn into that."

"Our official at the state department yet defending whether or not this was a coupe because as you know, J.

There is legislation that was passed by Congress signed into law by the president that if there's a military could that could end US military and economic assistance to Egypt which totals what a billion and a half dollars a year."

"Right and there's another money for, you know, other purposes but they are not.

In fact, I asked that question that they are not saying at this point and it's a crucial question.

You're right, Wolf.

Is it a coup?

Because that could define whether or not the US would have to pull the aid.

However, as we've been saying,

there is a way that secretary of state, John Kerry, could have a waiver,

if they decided that it was a national security interest of the United States or there might be another reason.

So, that would be looking for that definition if they even give it very soon.

You know, it actually has a lot of implications to say that it's a coup.

So, I'm sure they won't do that lightly or very quickly.