Factbox-Who are Yemen's Houthis?

DUBAI (Reuters) - Yemen's Iran-aligned Houthi movement has been battling a Saudi-led military coalition since 2015. U.S. Secretary of State Mike Pompeo said on Sunday Congress would be notified of his intent to designate the movement as a foreign terrorist organization, in what would be one of the final acts of the outgoing Trump administration before Joe Biden's inauguration as president on Jan. 20.

Here are some details about the group, also known as Ansar Allah.