This is the Global News Podcast from the BBC World Service.

I'm Nick Miles and in the early hours of Saturday the 13th of July,

these are our main stories.

President Biden has spoken at a campaign event in Michigan to try to shore up support as

more Democrats urge him to abandon his bid for re-election because of concerns

about his age. Officials in Central Nigeria say at least 16 people have been killed

when a two-story school building collapsed. Kenya's president has replaced his

police chief after officers shot dead dozens of people protesting against tax hike plans last month.

The BBC has been told that the Gaza ceasefire negotiations being held in Qatar and Egypt have ended without success.

Also in this podcast, another way people are fighting for Ukraine.

Instead of holding up a weapon, I held up my baton and decided I could fight on the cultural front.

The Freedom Orchestra, which has begun a European tour.

President Biden flew to the US state of Michigan on Friday as he attempts to

steady the nerves of fellow Democrats and votes who are increasingly concerned about his

re-election campaign. Hours earlier, the leader of the Democrats in the House of

Representatives Hakim Jeffress met the President to discuss his colleagues' worries.

He's reported to have bluntly shared their views.

Nearly 20 congressional Democrats have now publicly urged Mr Biden to withdraw after his poor TV debate performance last month with Donald Trump.

Then on Thursday at a NATO summit Mr. Biden made two high-profile gaffs at his first unscripted news conference for eight months.

So it was against this background that the US President addressed a Friday evening campaign

rally in Detroit.

Folks, you probably noticed, there's a lot of speculation lately.

...