Despite the controversy, however, he vowed to remain in the race.
Weiner has avoided questions about his extramarital online affairs while campaigning but did say that more revelations could be uncovered.
"I said that other texts and photos were likely to come out, and today they have," Weiner said in a statement, according to USA Today.
"These things that I did were wrong and hurtful to my wife and caused us to go through challenges in our marriage that extended past my resignation from Congress."
The new photos he's referring to are from Facebook messages he sent a 22-year-old woman after his resignation when the initial photos and messages came to light.
The new messages were between himself and the young woman in an online relationship that apparently lasted about 18 months.
Weiner has said his behavior has had serious repercussions for his marriage with former Hilary Clinton advisor Huma Abedin, but the two have stayed together. Abedin has even began campaigning and fundraising for her husband who faces a tough race for the New York mayorship.
His chances against current New York City council-speaker Christine Quinn were believed to be slim, but he has since become the frontrunner in the race.
Weiner, 48, told media on Tuesday that while his opponents have called for him to step down, he's not going anywhere.
"I want to bring my vision to the people of the city of New York. I hope they are willing to still continue to give me a second chance," Weiner said, according to Reuters.
He also suggested some of the accusations against him had been fabricated.
His wife told reporters she's remaining steadfast alongside her husband.
"I love him. I have forgiven him. I believe in him,” Abedin said, NBC News reported. “And, as we have said from the beginning, we are moving forward.”
The lewd photos and messages were posted on the gossip website, The Dirty.com, on Monday.