BATON ROUGE, La. — John McCain challenged Barack Obama to join him in 10 town-hall meetings with voters before the Democratic convention in August.

An Obama adviser was receptive to the idea and said the campaign would discuss it.

McCain, the Republican nominee-in-waiting, sent his rival a letter outlining the offer yesterday, the day after Obama clinched the Democratic nomination. McCain suggested the first town hall be held June 12 in New York.

"We need to now sit down and work out a way that we can have these town hall meetings and have a great debate," McCain said yesterday in Baton Rouge.

He credits a more intimate town hall format, a give-and-take with audience members chosen at random, for his victory in New Hampshire that launched his climb to the GOP nomination. McCain said the style would tell voters more than the typical formal, televised debates.

"I don't think we need any big media-run production, no process question from reporters, no spin rooms," McCain said. "Just two Americans running for office in the greatest nation on earth, responding to the questions of the people whose trust we must earn."

McCain said President Kennedy had made such an agreement with former Senator Barry Goldwater for the 1964 election before Kennedy's assassination.

A McCain adviser first floated the idea last month. At the time, Obama said, "I think that's a great idea."

"Obviously, we would have to think through the logistics on that, but ... if I have the opportunity to debate substantive issues before the voters with John McCain, that's something that I am going to welcome," Obama said in Bend, Ore., in May.

Obama campaign manager David Plouffe said yesterday that while the idea is appealing, the campaign would recommend a less-structured, lengthier exchange more in line with the historic Lincoln-Douglas debates.

In the Lincoln-Douglas debates, held seven times during Abraham Lincoln's losing Senate campaign against Stephen Douglas in Illinois in 1858, a candidate spoke for an hour, the other for an hour and a half, and the first candidate was allowed a half-hour rebuttal.

Obama, speaking yesterday to Jewish leaders in Washington, linked McCain to Bush administration policies on Middle East issues that he described as disastrous.