Can Iranian influence be contained?

Mike Pompeo has wrapped up his three country tour of the Middle East in Jordan.

America's top diplomat highlighted the importance of the Jordanian role in helping solve conflicts in neighbouring countries.

In particular, he urged Palestinian leaders to re-engage in talks with Israel.

And Pompeo urged a united front against what the White House says is the regional threat posed by Iran - the message he emphasised earlier in both Saudi Arabia and Israel.

But what kind of threat is Iran to the US and the region?

And how will it be confronted?