As Donald Trump returns to the White House, the world braces for what comes next. Every Friday, Battle Lines will turn its focus to the US and look at how Trump’s foreign policy decisions are reshaping the world.

On today’s episode, we look at Donald Trump's first week in office. Roland Oliphant is joined from Washington by The Telegraph's Katie O'Neill to get the latest, and speaks with the author and historian Robert Merry about the 19th century President William McKinley, who appears to be the inspiration for Trump's new American expansionism.

Plus: former soldier Chris Purdy tells us why many veterans are alarmed at Donald Trump's pick for Defense secretary Pete Hegseth.

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