"If someone challenges the data's credibility, we have to make sure it is correct."

He has already challenged Mr. Harris's credibility, citing his past drug use and mental problems.

And then jump over to challenge the president's credibility or my credibility.

The lack of a contemporaneous complaint may also allow General Kennedy's detractors to challenge her credibility.

The general's rivals are already challenging his credibility on military matters.

"I don't think it's appropriate to challenge the man's credibility in that context."

The lawyers are also ready to challenge Ms. Lewinsky's credibility if witnesses are called at a trial.

She said, "A defendant must have the right to know the evidence being used against him, to respond to it, and to challenge its credibility or authenticity."

Her court conviction was later exploited by the government to challenge her credibility as a journalist.

Prosecutors have also indicated they will challenge Ms. Bell's credibility.