Rep. Tom Petri (R-Wis.) will retire at the end of his current term, his office announced Friday. Petri has served in Congress since 1979.

The Republican, 73, will make a statement announcing his retirement at a Monday town hall meeting, his office said. The news comes eight days after state Sen. Glenn Grothman announced that he would challenge Petri in the Republican primary.

Petri's 6th district leans Republican. The Oshkosh and Fond du Lac seat was carried by Mitt Romney, won 53 percent of the vote there in 2012. In 2008, President Obama edged out Sen. John McCain (R-Ariz.) by a tenth of a percentage point.

First elected in a special election, Petri sits on the Transportation and Infrastructure committee as well as the Education and Workforce Committee. He was rated the 203rd most conservative member of the House in National Journal's 2013 Vote Ratings, putting him on the moderate end of the GOP Conference.

Petri is the 27th member of the House to announce plans to retire.