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The Republican race for the White House is getting crowded. With eight candidates all gathering in Iowa to campaign, eat roast pork and ride motorbikes, the Americast team looks at who came out on top and whether any of them could beat Donald Trump, who is facing fresh criminal charges over his handling of classified documents.

Harvard professor Steven Pinker, who sees himself as a liberal, tells us why he thinks academic freedom is under threat on US college campuses.

And first, Sarah wanders through the White House with the BBC\\u2019s political editor, Chris Mason, who has flown with the prime minister to Washington.

HOSTS:\\n\\u2022 Justin Webb, Radio 4 presenter\\n\\u2022 Sarah Smith, North America editor\\n\\u2022 Marianna Spring, disinformation and social media correspondent\\n\\u2022 Anthony Zurcher, North America correspondent

GUEST:\\n\\u2022 Steven Pinker, Professor of Psychology at Harvard University

GET IN TOUCH:\\n\\u2022 Send us a message or voice note via WhatsApp to +44 330 123 9480\\n\\u2022 Email Americast@bbc.co.uk\\n\\u2022 Or use #Americast

Find out more about our award-winning \\u201cundercover voters\\u201d here: bbc.in/3lFddSF.

This episode was made by Daniel Wittenberg, with Alix Pickles, Natasha Fernandes and Alex Collins. The technical producer was Gareth Jones and the sound designer was David Crackles. The editor is Jonathan Aspinwall.