Vista Republican Darrell Issa will not run for a 10th term in Congress, giving Democrats a much better chance of flipping a once reliable California Republican seat.
Those results made Issa perhaps the most endangered Republican member of Congress heading into the 2018 election cycle.
Issa was a leader of the Republican congressional charge to investigate the Obama administration's handling of the attacks in Benghazi, where the USA ambassador, Christopher Stevens, and three other Americans were killed by militants on September 11, 2012.
Issa was first elected to the House in 2000, and served as chairman of the House Oversight Committee from 2011 to 2015.
Royce and Issa's districts are both in expensive television markets - further stretching national Republicans who are on defense across dozens of districts in the 2018 midterm elections.
In 2016, Issa narrowly won his re-election bid against Democrat Doug Applegate, a retired Marine colonel who has said he will run again this year. The district - a part of Southern California that swung in favor of Hillary Clinton in 2016 - has since been listed as a top target by the Democratic Congressional Campaign Committee. Hillary Clinton won the district by almost 7 points in the 2016 election.
But in 2018, the Democrats' efforts to unseat Issa already began snowballing.
His retirement opens up another seat for Democrats to try and flip in the competitive San Diego-area district. "Yet with the support of my family, I have decided that I will not seek reelection in California's 49th District".
The Democratic Congressional Campaign Committee placed field organizers in Issa's district almost a near ago, and opened an Orange County office past year aimed at flipping the Issa and Royce seats to Democrats.
Republicans, meanwhile, say they will benefit from the fight between the Democrats seeking to claim the seat. We look forward to facing whoever limps out of the Democrats' battle royale: "black and blue, and broke", Stivers said in a statement.
But the Democratic Congressional Campaign Committee suggested otherwise.