At 3.30 this afternoon, President Obama will go to Westminster Hall to address both houses of parliament.

Paul Glastris, a former speech writer for President Clinton, breaks down the key elements of a good speech.

And Colleen Graffy, former deputy-assistant secretary of state in George W Bush's second term, looks at whether today's speech is really aimed at Britain or the US.

Get in touch with Today via email , Twitter or Facebook or text us on 84844.