Investors fear a Greek eurozone exit could trigger a fresh global crisis.
On Friday Mr Obama welcomed Francois Hollande to the White House to discuss economic affairs. The French president said he and Mr Obama shared “the same conviction that Greece must remain in the eurozone”.
President Obama said resolving the crisis is of “extraordinary importance” to the world.
Even before official proceedings began, David Cameron clashed with Francois Hollande over the new French president’s proposals for a Europe-wide tax on financial transactions.
Mr Cameron issued a blunt warning that Britain would not accept such a tax, insisting it was not “a sensible measure”.
But Ainslie, who said the torch leg was so special it ranked alongside winning one of his Olympic gold medal: said “It was one of those moments where I was in a bit of shock really At least I didn’t trip over”.
Land’s End was crowded with thousands of flag waving spectators, flag-adorned dogs, small children with handmade torches and a buzz rarely seen at 6am.
London 2012 chief executive Paul Deighton exclaimed elatedly when Ainslie lit the torch successfully: “There you go, no problem”.
Ainslie, who has just won his sixth Finn world championships and will start favourite to win a fourth Olympic gold medal, said he was confident about his Olympic preparations.
“Medal race day August 5 is a big day for me,” Ainslie, 35, said.
Somebody finally made an orthopedic bed just for MEN.
No more snoring again – will be sleeping on stomach 99% of the time.