<span style="color: #222222;">British Prime Minister Boris Johnson has spoken to Joe Biden for the first time since the new US president was inaugurated.<br />'' <br />'' Mr Johnson said on Twitter that he looked forward to "deepening the longstanding alliance" between the UK and the US as they drove a "green and sustainable recovery from Covid-19".<br />'' <br />'' A Downing Street spokesman said Mr Johnson  warmly welcomed  the president's decision to rejoin the Paris Agreement on climate change and the World Health Organization – both abandoned by Mr Biden's predecessor, Donald Trump.<br />'' <br />''<br />''Mr Biden was sworn in as president and Kamala Harris as vice-president in a ceremony in Washington on Wednesday.</span>