The Labour leader says despite questions about the timing of decisions, "we've all got to pull together now to make this work".
Labour Party leadership election
By Iain Watson
Political correspondent, BBC News
The Labour leader says he wanted to be able to "draw a line in the sand" after the report's publication.
The government should “rethink very quickly” its handling of A-level grades for students in English schools,says Keir Starmer.
Local Democracy Reporting ServiceCopyright: PA
Sadiq Khan has welcomed Keir Starmer’s election as leader of the Labour party, saying he is “best suited” to hold the Government to account during the coronavirus outbreak.
The Mayor of London said changes in the party were “clearly necessary to put ourselves back on the path to forming a Labour Government”.But he said he was confident Sir Keir would rise to “the scale of this challenge”.
Labour members and affiliated unions chose the Holborn and St Pancras MP to replace Jeremy Corbyn as party leader on Saturday, with Angela Rayner succeeding former MP Tom Watson as deputy leader.
Sir Keir took control of the party with a decisive victory, gaining 56% of the first round of voting.
Rivals Rebecca Long-Bailey and Lisa Nandy finished on 28% and 16% respectively.
London’s Mayor previously backed Sir Keir for the top job, saying he was “the best person to unite our party, take the fight to the Tories and put Labour in government”.
Speaking after the leadership results on Saturday, Mr Khan said he was “delighted” with the result.
By Brian Wheeler
New Labour Party leader Sir Keir Starmer speaks of the effect of coronavirus on the UK.
Sir Keir Starmer supporter David Lammy says his election win is “good news for the country”.
We profile the new Labour leader who hopes to unite supporters of both Corbyn and Blair.