HOUSTON -

Houston Astros manager Bo Porter has been relieved of his duties, the team announced Monday morning.

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Tom Lawless will take over as manager on an interim basis through the remainder of the season.

Bench coach Dave Trembley has been relieved of his duties as well. Adam Everett will join the coaching staff, replacing Trembley as bench coach. The remaining coaches will continue in their current roles.

As to why Astros GM Jeff Luhnow didn't wait until the end of the season, he said at Monday's press conference it was better for the team and for Porter to get a jumpstart on finding a new candidate and a new job, respectively.

"When you look at the sum win-loss totals the last two years, that's not on Bo, that's on me," Luhnow said.

The search for a new manager will begin immediately, the team said. Luhnow said Lawless would be a candidate if he's interested, but said he couldn't talk about specific candidates at this point.

Recent reports highlighted a rift between Porter and Luhnow.

Porter joined the team in September 2012 and the Astros went 51-111 in the 2013 season.

"The goal is simple: It's to win. That's the goal. Win as soon as possible," Luhnow said.

The Astros need four more wins this month to avoid a fourth consecutive 100-loss season.

Porter released the following statement:

I want to thank the Astros Organization for giving me my first opportunity to Manage Major League Baseball.

During my time in Houston I dedicated myself to do everything I could to help this Organization win, in the short-term and for the long-term.

I am proud of what we were able to accomplish in Houston with an Organization in transition. I'm gratified we were able to bring some excitement to this city as a result of our improvement from 2013 to 2014.

I am enthusiastic about what the future will bring for me and my family. I look forward to my next opportunity in Major League Baseball. The valuable experience I gained with the Astros will be extremely beneficial in all my future endeavors.

I want to especially thank my players, my staff and support staff for all their efforts in our attempt to develop a Championship culture doing my time as Manager of the Houston Astros.

I want to thank the baseball community for your kind words and the countless text messages, phone calls, voicemails and emails. Your support is what makes our game and industry so great!

Last but surely not least I want to thank the city of Houston and the fans for the incredible support they have shown towards me and my family during our time in Houston.

I wish the Astros well in the future and look forward to the next chapter of my baseball career.

Luhnow released a statement which read in part:

"Bo's passion and energy are unparalleled, and his desire to win unquestioned.  This decision was not made because of our current level of competitiveness in the Major Leagues. I recognize that our win-loss record is largely a product of an organizational strategy for which I am responsible. Rather, I made this decision because I believe we need a new direction in our clubhouse. What we will seek going forward is a consistent and united message throughout the entire organization.  It is essential that as an organization we create an atmosphere at the Major League level where our young players can come up and continue to develop and succeed.  Ultimately, I am responsible for creating that culture, and I will do everything in my power to do so—even when it means making difficult moves like the one we made today.  Moving forward, I am optimistic about the direction of our team.  Our young core continues to progress, and  I believe wholeheartedly that our plan—while at times challenging—is working and will bring a consistent winner to Houston in the very near future. We wish Bo and his family well, and feel he will be successful in future endeavors."