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The new US President Joe Biden has begun to undo some of Donald Trump's key policies. In his initial acts as the 46th US president, he signed executive orders to boost the response to coronavirus and reverse Trump's actions on climate change and immigration. We'll explain what's already been done and what President Biden might do next.

Also, there's been a double suicide bombing in Baghdad, Iraq's capital. At least 30 people have been killed and 100 others injured in the attacks in a busy square. We'll speak to a reporter who's been to the scene and analyse what this means for Iraq and its people.

And every day we are joined by a health expert to help us understand the latest news about coronavirus and to answer your questions. Today our guest is Dr Emma Hodcroft, a molecular epidemiologist at the University of Bern in Switzerland.

(Credit: President Joe Biden signing executive orders inside the White House Oval office, 20/01/2021. Credit: Reuters)