California Republican Rep. Darrell Issa announced Friday he will retire from Congress rather than seek reelection in a redrawn Southern California district, reversing a public pledge made just three months earlier that he would not quit. The retirement adds uncertainty to the race for the 48th Congressional District and intensifies pressure on Republicans’ already slim House majority.

Issa’s exit is a direct consequence of California’s new congressional map, approved by voters in November and spearheaded by Democratic Gov. Gavin Newsom, which is designed to flip as many as five Republican-held seats ahead of November’s midterm elections.

“It’s the right time for a new chapter and new challenges,” Issa said in a statement. “Serving in Congress has been the honor of my life.”

The announcement marked a stark reversal. In December, after the new map passed, Issa said he would stay and compete. “I can hold this seat. I’m not quitting on California and neither should anyone else,” he said at the time.

A wealthy veteran of the oversight wars

Issa, a car alarm magnate considered one of the wealthiest members of Congress, built a national profile as a chief antagonist of President Barack Obama and Secretary of State Hillary Clinton during his tenure as chair of the House Oversight and Government Reform Committee, which he held from 2011 to early 2015.

His 48th District, anchored in San Diego County, was drastically reshaped when voters approved the new map in November. Issa had also floated the idea of leaving California to run for Congress in Texas before opting to remain in his home state — a calculation he ultimately reversed Friday.

In his statement, Issa endorsed San Diego County Supervisor James Desmond to succeed him in the race.

Stakes for House control

With an incumbent out of the running, Republicans face a harder path to holding the seat. The party’s majority in the House is already narrow, and the California map is explicitly aimed at offsetting President Donald Trump’s parallel push in Texas to add seats for Republicans.

A national battle over congressional district boundaries remains unresolved in several states. Voters in Texas and North Carolina have already cast ballots in primaries for redrawn House districts. In Missouri, candidates are filing for office even as final boundaries remain uncertain. Virginia’s new congressional districts could hinge on both a voter referendum and court rulings.