As their investigation into her predecessor continues, Senate Democrats agreed Wednesday to make Sen. Harriette Chandler of Worcester the permanent president of the Senate for the remainder of the year, and will vote Thursday to remove "acting" from her title.

The decision, according to Chandler, is intended to send a message that the Senate wants to put the turmoil caused by questions about former Senate President Stanley Rosenberg's future in the rearview mirror so that the body can focus on policy priorities for the remaining six months of the formal, two-year session.

Chandler, 80, will not be a candidate for the permanent position in January when the next Senate is scheduled to elect a new Senate president. She said it will be up to Rosenberg whether he stands for election at that time. All members of the Senate are first up for re-election to their seats this fall.

The decision was announced after Senate Democrats met for more than three hours in a private caucus. It's a clear and potentially permanent step away from Rosenberg, who is the subject of a Senate Ethics Committee investigation. While senators say they are trying to create a stable environment, the branch remains at risk of being riled by months of wrangling this year by potential Chandler successors.

Wednesday's decision was a departure from the posture Senate Democrats have been holding since December, when they authorized the Senate Ethics Committee to conduct an investigation into whether Rosenberg violated any Senate rules in connection with the activities of his husband, Bryon Hefner. Hefner has been accused of sexually harassing men with business before the Legislature and meddling in Senate affairs.

Up until now, many senators had been pointing to the investigation as a reason to hold off on making any final decisions on leadership until the findings were released. That position started to lose credibility with some senators after another story over the weekend in the Boston Globe in which it was alledged that Rosenberg's promised firewall to keep Hefner out of Senate business had been breached.

Hogan Lovells, the law firm hired by the Ethics Committee to conduct the Rosenberg probe, continues to explore the charges of harassment and Senate interference by Hefner, but some senators began to feel that the mounting stories in the press had created too much of a distraction. One member of the Ethics Committee, Sen. Richard Ross, said there was "a long way to go" before the investigation would be completed.

Rosenberg, who has expressed hope his name will be cleared, remains a senator and has taken out nomination papers with plans to seek re-election this year.

Chandler emerged from the president's suite with the full Democratic caucus behind her shortly after 2 p.m. to read a prepared statement and answered a few questions.

"Today, the Democratic caucus voiced their support to continue my term through the end of 2018. An election will be held on the first date of the 2019 season, which is January 2, as is the normal course of business for the Senate," she said.

Chandler said that following the Thursday vote to remove the "acting" adjective from her title, she plans to move into the president's office full-time, and select a new majority leader. She currently hold both titles.

"Our focus today continues to be on policy, the budget and the business of legislating," she said.

Asked if she would be a candidate for the presidency next year, Chandler said, "No, no," but said she would be seeking re-election to her seat.

"We have now reached a point where we are into the business of doing what we're here to do, which is legislating,"  Chandler said. "We have a budget, Joint Rule 10 day. We have work to do for the people who have elected us, and acting doesn't quite do it anymore. We are now at the point where we need a president who has the full responsibilities and the full authority of a president of the Senate."

A spokesman for Gov. Charlie Baker said the administration "looks forward to continuing to work with Senate President Chandler to tackle the pressing legislative priorities remaining this session, including the administration’s opioid, public safety and affordable housing proposals."

Four senators have already expressed interest publicly and to their colleagues that they aspire to the presidency.

Questioned on whether she had asked those senators to refrain from lobbying colleagues for votes, Chandler said, "They were among the people, they're all in there, and they were among the people who agreed to this and voted for it."

Senate Ways and Means Chairwoman Karen Spilka, her vice-chair, Sen. Sal DiDomenico, and Sens. Eileen Donoghue and Eric Lesser are all considered potential successors to Chandler. The new development means their potential candidacies could become an issue in Senate races around the state this year. Even Senate Minority Leader Bruce Tarr, who leads a seven-man Republican caucus, could make a case during the 2018 campaign season for a Tarr presidency in 2019.

Donoghue said the decision made by the Democratic caucus Wednesday was to "clarify the situation for 2018," but as for her continued interest in the presidency she said, "We'll cross that bridge when we come to it."

Lesser predicted the behind-the-scenes jockeying for support as the next president would now take a backseat to making the remainder of the legislative session a productive one.

"I think it's sort of implied, so everyone is ready to take a pause, we're ready to focus on Joint Rule 10 Day, we're ready to focus on the budget, we're all united behind Harriette Chandler and we'll have a discussion about the future in the new session," he said.

Lesser, however, did acknowledge his interest in the post.

"I'm thinking about it. We'll follow up soon," Lesser said. "I'm certainly considering it because I think I would have potentially a role to play in helping shape the future. For now, we fully support President Chandler, she has my 100 percent support and enthusiastic support to finish out the term, and a new year and a new session is a new opportunity to have a conversation about the future of the body."

Informal sessions are scheduled over the last five months of 2018, which would give potential presidency candidates a window before January to lobby colleagues, although there's nothing stopping them from trying to round up the votes as soon as they wish.

Sen. Tarr said the Republican caucus will be "fully supportive" of the decision to firm up Chandler's position as leader of the Senate.

"I think it's a very viable solution. I think it brings stability," Tarr told reporters. "As far as I'm concerned, Senate President Chandler is the president. I think we need to clarify that and confirm it because we have a lot of work to do and the question will be off the table for the remainder of this session, and I think that's appropriate."

The Republican leader, who said earlier Wednesday that his caucus directed him "to pursue the presidency as vigorously as possible," said he thinks settling the question of Senate leadership for the rest of this year will create a more stable process of selecting a new president.

"I think it removes the sense of urgency that potential candidates will have that someone is going to wake up tomorrow and read that somebody else has the votes," he said. "I think it's human nature that people are interested in being Senate president and aren't going to stop being interested in Senate president for the rest of the year, but what it does do is allow us to focus not on a race for Senate president but on the matters that are before us as a Legislature and they are many."

Asked whether the decision to stick with Chandler through 2018 forecloses the possibility that Rosenberg could return as Senate president, Tarr said, "I think as a practical matter, the answer is yes."

Michael P. Norton contributed to this report.