The website said the incident was recorded March 1.
Iowa Starting Line reports the video was provided by people who witnessed Dix's interactions with the lobbyist at the Waveland Tap bar on March 1st.
Republican State Senator Amy Sinclair recently introduced a bill that would require Iowa's public colleges and universities to formally recognize and respect the right of student organizations to impose religious requirements for leadership positions, as well as banning so-called "free speech zones".
"Dix, "...made the right decision for himself and for his district, but most importantly, I believe he made the decision in the best interest of his family". He had been in the Senate since 2011, and was elected as Republican leader in 2013.
Dix did not comment on the circumstances surrounding his resignation as majority leader and as state senator, though Republican Senate President Jack Whitver alluded to the website's allegations in a statement.
"I not only sponsored and voted for this amendment, but I was a leader who helped shepard (sic) this amendment through the Iowa House", Dix boasted in 2006, when he ran unsuccessfully for Iowa's 1st Congressional District seat. "His resignation letter to Iowa Senate President Jack Whitver and Speaker of the Iowa House, Linda Upmeyer in accordance with Iowa Code section 69.4 is attached".
Iowa Starting Line says the woman in the video is a lobbyist for a municipality group.
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But by early afternoon, Dix made the decision to end his Senate stay in the final year of his second term. "They expect us to lead and I expect to lead", the governor said.
Pictured, Republican Iowa Senate Majority Leader Bill Dix on his wedding day with then new wife, Gerri Dix. Over the summer, Iowa Senate Republicans lost a harassment lawsuit filed against them by former communications director Kirsten Anderson to the tune of $2.2 Million.
A married Republican senate leader has stepped down after video emerged showing him making out with a woman in a bar.
Dix has maintained the ex-staffer was sacked for poor performance.
An internal report later revealed senators made 'sexually suggestive comments' or discussed 'sexual preferences' on the chamber floor in recent years, and staff members in the Republican Senate office were unlikely to report misconduct because of fear of retaliation. He became majority leader after GOP lawmakers took control of the chamber following the 2016 election.
Iowa Gov. Kim Reynolds plans to meet with the state Senate's top leader after a website posted photos and video allegedly showing the married Republican kissing a statehouse lobbyist.