Democratic nominee Troy Jackson has agreed to four televised debates against Republican U.S. Sen. Susan Collins.

Jackson said in a Friday news release that he wants the debates to occur within a two-week period in October, and he wants at least one to feature voters asking questions. Collins’ team says they’ve agreed on the dates and the debate hosts, but it’s unclear whether Collins will accept the formats announced by Jackson.

The televised debates will be an opportunity for voters to take stock of the two candidates who are competing in one of the most closely watched Senate races in the country.

The first faceoff between Jackson and Collins will be Oct. 6 in a televised debate on WGME. They will meet again two days later on WMTW.

Then comes a debate hosted by WABI/WAGM, TV stations based in Bangor and Presque Isle, on Oct. 13.

The final debate will be hosted on Oct. 15 by News Center Maine, Maine Public and the Portland Press Herald, which proposed having a live audience. Jackson said he would also like to take questions from voters.

Collins’ campaign announced last week that it had accepted four debates by the same hosts, but did not include dates or specifics.

Jackson’s announcement marks the latest turn in a week of back and forth over the timing and format of the debates. Collins called for a series of debates in early September, while Jackson said he wanted two town hall-style debates where the members of the public could ask the candidates questions.

Collins spokesperson Blake Kernen criticized Jackson for not debating before absentee voting begins on Oct. 5.

“It’s great that Troy Jackson has finally agreed to the four debates that we announced 8 days ago, but it is telling that he still refuses to participate in a debate next week,” Kernen said in a written statement. “He said on August 25th that he would debate ‘tomorrow.’ Now the first debate won’t be until 40 days later on October 6th and — most important — after early voting has already begun. By contrast, Sara Gideon and Susan Collins had two debates in September — Troy won’t even agree to one.”

Jackson also invited Collins to join him at his town hall events this week. At events in Lewiston and Gorham, Jackson spoke next to an empty chair to highlight Collins’ absence and criticize her for not holding a town hall event in 25 years.

“Susan Collins has spent 25 years avoiding public town halls, so I’m glad she’ll at least have to stand on a stage with me four times this October and answer for her record,” Jackson said in a written statement. “But Mainers deserve the chance to look both of us in the eye and ask us questions directly. I’ll show up anywhere, anytime to answer questions from the people of Maine. Senator Collins is welcome to do the same.”

Collins’ campaign has noted that the senator routinely meets with constituents at a variety of community events, and has taken audience questions at some gatherings. She also routinely takes questions from reporters.