Web users can log onto the White House site as early as 6 p.m. EDT Wednesday and pose a question to Card. The White House will pick the questions and begin posting them and Card's responses at 7 p.m. EDT. The session will last a half-hour.
"It's important that the voices of the American people are heard, and the president works hard to listen to them through a variety of means," White House spokesman Ari Fleischer said. "This is one more means."
Card's appearance will be the first in what Fleischer called "periodic" sessions with administration officials. The new effort is dubbed "Ask the White House." The president is not expected to field questions.
Environmental Protection Agency chief Christie Whitman will take questions on the site April 22, said another White House spokesman, Jimmy Orr.
Mark Forman, associate director of information technology, fields questions Thursday as the administration unveils a new Office of Electronic Government.