Sarah Palin, John McCain's running mate in the US presidential election, is preparing to address the Republican National Convention.
Her speech will be intensely scrutinised, after she revealed her unmarried daughter, 17, was pregnant.
Mr McCain is due to be nominated on Thursday as the party's presidential candidate for the 4 November election.
On Tuesday, President George W Bush told delegates that Mr McCain was "a great American and the next president".
Some unease
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The Alaskan governor's selection as vice-presidential nominee has caused great excitement among social conservatives and evangelical Christians gathered at the convention, says the BBC's Adam Brookes in St Paul.
But across the broader Republican Party, there seems to be some unease at the choice of someone who is an unknown quantity, he says.
Former New York Mayor Rudy Giuliani, who made a failed attempt to win the Republican nomination for president, defended her in a television interview for the CBS Early Show.
He said she had more experience that Democratic candidate Barack Obama.
"I would say Barack Obama has never governed a city, never governed a state, never governed an agency, never run a military unit, never run anything," he said.
Mrs Palin announced on Monday that her 17-year-old daughter, Bristol, was pregnant, and would have the baby and marry her boyfriend.
It also was revealed that an attorney had been hired to represent Mrs Palin in an Alaska state ethics investigation.
The case involves alleged abuse of power involving her former brother-in-law.
Mrs Palin was elected governor of Alaska in 2006 and before that was mayor of the small town of Wasilla, Alaska.
She is due to be formally nominated by delegates as the party's vice-presidential choice later this week.
The party's four-day convention opened on Monday although it was initially curtailed because of the threat of Hurricane Gustav to states on the southern US coast.
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(BBC)
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