This is the Guardian.

Today, a pivotal week for Joe Biden,

as he seeks to prove he's not too old and frail to run for president. Businesses across the land, whatever kind of business you're in.

B.T.'s got your back. We're talking small business, big business, new business, old business, top secret business.

Well that's your business.

But yes, global business, serious business, family business.

What about show business?

Yes, all the business is.

So whatever your business, let us take care of business

with our secure and reliable connectivity.

BT's got your back.

Search BT's got your back. back. It's a big week for Joe Biden, the 81-year-old with the biggest job in the world.

He's welcoming international leaders to a major NATO summit in Washington, marking 75 years of the alliance. He's in the spotlight on the global stage at a very

difficult time for him at home where he's facing calls from senior Democrats and

donors to withdraw from the presidential race.

So the main event for Biden this week is going to come on Thursday when he holds a NATO press conference.

And that will be his first really big opportunity to show that he is up to the task of leading the nation for another four years.

And I think specifically that he can answer questions in an unscripted format in a way that is both very coherent and robust because that is something that people are deeply concerned about right now.

For months, Joan Grieve, a senior political reporter for Guardian U.S. has been watching every move of the

increasingly beleaguered president. One problem that Biden has had in recent

months that could come back to haunt him during this NATO conference is that he has occasionally seemed to mix up

the names of NATO leaders. America's back and meter on from Germany, I mean from France, looked at me and said, said, you know, why, how long you back to at times he has referred to leaders from long in the past even as if they are leading nations like France and Germany today and that has been really concerning for not just Americans

...