CHARLOTTE, N.C. – President Bush, told by a critic he should be ashamed of his policies, defended the government’s secret wiretapping program yesterday and said he would not apologize for listening in on the phone and e-mail conversations of Americans talking to people with suspected Al Qaeda links.

A man who identified himself as Harry Taylor rose at a forum here to tell Mr. Bush that he’s never felt more ashamed of the leadership of his country. He said Mr. Bush has asserted his right to tap phone calls without a warrant, to arrest people and hold them without charges, and to revoke a woman’s right to an abortion, among other things.

He was booed by the audience, but Mr. Bush interrupted and urged the audience to let Mr. Taylor finish.

“I feel like despite your rhetoric, that compassion and common sense have been left far behind during your administration,” Mr.Taylor said, standing in a balcony seat and looking down at Mr. Bush onstage. “And I would hope from time to time that you have the humility and grace to be ashamed of yourself.”

Mr. Bush defended the National Security Administration’s wiretapping program, saying he authorized the program to protect the country.

“You said would I apologize for that?” Mr. Bush told him. “The answer is absolutely not.”

The challenge to the president came near the end of a lengthy appearance before the World Affairs Council of Charlotte, where he took questions from the audience. This has become a regular feature of Mr. Bush’s appearances as he tries to revive public support for his leadership.

Despite a couple tough questions, the president got plenty of softballs. One woman requested a picture with him and another asked about how young people can get involved to help. One questioner simply told the president people are praying for him and another said he has a friend from Iraq who is grateful that he has made the country safer.

White House press secretary Scott McClellan said the World Affairs Council handed out the bulk of the 1,000 tickets for the event, with the remaining 250 tickets handed out by the host, Central Piedmont Community College.

Outside, Mr. Bush’s motorcade came within sight of at least a couple hundred protesters outside the hall. They chanted, “Do your job!” and held signs with phrases such as “Liar” and “Worst President Ever.”

Mr. Bush was also asked what he would have done differently in the Iraq war. He talked about different tactics for police and security training and for reconstruction and he expressed strong regret about the abuse of inmates at Abu Ghraib prison.

“What took place there and the pictures there just represented everything there that we didn’t stand for,and it hurt us,” Mr. Bush said. “It gave the enemy a fantastic opportunity to use it for propaganda reasons. … I wish that can be done over. It was a disgraceful experience.”