Republican Rep. John Shimkus will not run for a 13th term in his southeastern Illinois district, vacating what will likely remain a safe Republican seat in 2020.

Shimkus announced his decision Friday afternoon, saying he wanted to make his plans known as candidates begin to circulate petitions for office next week.

“Serving in Congress has been a blessing, but it has also been a sacrifice for my wife Karen, and our boys,” he said in a statement. “I regret the times I have been away from the four of them and thank them for their constant love and support.”

Shimkus is the 10th House Republican to announce plans to retire in 2020. Shimkus unsuccessfully ran for Energy and Commerce Committee chairman in 2016, losing to Oregon Rep. Greg Walden.

He had been raising money this year to run again, with total receipts of $257,000 in the quarter ending June 30 and nearly $1.2 million in his campaign account. During the same period, no Democrat reported any fundraising to oppose him, according to Federal Election Commission records.