The two-sentence letter to ethics committee Chairman Jo Bonner, R-Ala., and ranking member Linda Sanchez, D-Calif., read:
"On June 6, 2011, Rep. Anthony Weiner disclosed conduct which he described as inappropriate.
"An investigation by the ethics committee to determine whether the Rules of the House of Representatives have been violated is warranted."
After the Democratic New York congressman revealed he sent lewd photos of himself, conducted inappropriate online relationships several times then lied about it Monday, Pelosi called for an ethics committee investigation to determine whether any congressional resources were used or any violations of House rules occurred.
During his sometimes tearful news conference, Weiner said he did not believe he used House-issued equipment nor violated any laws or oaths.
However, one woman Weiner called alleged he used a congressional phone for phone sex.
Lisa Weiss, a 40-year-old Las Vegas blackjack dealer who claims to have had a nine-month "sexting," Facebook and sexual phone relationship, told celebrity Web site RadarOnline.com they often had cybersex during his working hours.
After a March 3 exchange, Weiner allegedly told her he had to end their chat because he was "off to class" to vote on a House healthcare bill, she alleged.
At one point Weiss gave her phone number to Weiner "and he called me from his office and we proceeded to talk dirty for at least 30 minutes," she told RadarOnline.
She said she was sure it was a government phone because she tried to call him back on that number a few days later.
"The number wouldn't connect to his office," she said. "Instead there was a recorded message that it was an outgoing U.S. Congress line only."
Weiss said she didn't initially plan to go public, but did so after she concluded Weiner was "a liar," RadarOnline said.
"I couldn't believe that Anthony didn't own up from the outset," she said.
Weiner's office did not immediately respond to a United Press International request for comment.